Mixing Weed and Alcohol: Effects, Risks & How To Stay Safe

Table of Contents

Key Takeaways

  • Alcohol raises blood THC. In controlled research, drinking alongside cannabis pushed peak blood THC well above cannabis-only levels, so the high lands harder and less predictably.
  • Driving gets far more dangerous. People who use both together are about twice as likely to drive impaired, and fatal-crash data show the combination beats either substance alone.
  • Weed can hide how drunk you are. That masked feeling leads to extra drinks, and it raises the odds of alcohol poisoning, the genuinely life-threatening risk here.
  • Greening out is rarely dangerous on its own. It usually passes in one to a few hours. Alcohol poisoning is the more serious risk.
  • The safest choice is not combining them. When use stops feeling optional, Reach Recovery can connect you to treatment and ways to pay for it.

Mixing weed and alcohol is one of the most common combinations in American social life, and one of the least predictable. Alcohol changes how your body absorbs THC, the main psychoactive compound in cannabis, which means the same joint or edible can hit much harder after a few drinks than it would on its own. The result is a high that’s stronger, harder to gauge, and riskier than either substance by itself.

People reach for both because each smooths the other out. A drink loosens you up, a little cannabis takes the edge off. What gets lost is how much the two change each other once they’re in your system.

What Happens When You Mix Weed and Alcohol?

Alcohol speeds up how fast THC enters your bloodstream, so the cannabis high feels stronger and comes on faster. This has been measured directly.

In a controlled study published in the American Association for Clinical Chemistry’s journal Clinical Chemistry, researchers gave participants vaporized cannabis with or without a low dose of alcohol. With alcohol on board, peak blood THC jumped from a median of about 42 to 67.5 micrograms per liter at the higher cannabis dose, a large and statistically significant increase (Hartman et al., 2015). More THC in the blood, faster, is why people so often feel far higher than they expected.

The effects don’t land the same way for everyone, though. How high you get depends on your tolerance, the strength and amount of each substance, whether you smoke, vape, or eat the cannabis, how much time passes between them, and what else is in your system. Edibles plus alcohol are the least predictable of all, because an edible’s effects are delayed and easy to underestimate while you keep drinking.

Common combined effects include intensified euphoria, deeper drowsiness, dizziness, nausea, sweating, anxiety, and paranoia. Coordination, memory, and judgment all take a bigger hit than they would from one substance alone.

Does Order Matter? Alcohol Before Weed vs. Weed Before Alcohol

Order changes the risk profile. Drink first, then use cannabis, and the alcohol already in your system speeds THC absorption, raising the odds of a stronger high and a green-out. Use cannabis first, then drink, and the picture flips in an unexpected way.

Cannabis can blunt the physical signals of getting drunk. A 1992 study found that cannabis slowed the rise of alcohol in the blood (Lukas et al., Neuropsychopharmacology), which sounds protective but isn’t. If you don’t feel the alcohol hitting, you tend to keep drinking. A daily-diary study of co-use found that on days people used cannabis first, they drank less alcohol overall but used more cannabis (Linden-Carmichael et al., 2020).

Neither order is safe. One raises the chance of greening out; the other raises the chance of drinking past your limit without noticing.

Why the Combination Feels Stronger (THC Absorption)

The mechanism is straightforward: alcohol increases the rate at which THC crosses into your blood. Higher peak THC, reached more quickly, produces a more intense effect than the same dose of cannabis without alcohol (Hartman et al., 2015).

Several factors change the outcome:

  • Your tolerance to each substance
  • How strong the drinks are and how fast you drink them
  • Whether the cannabis is smoked, vaped, or eaten
  • The time between using one and the other
  • Other drugs or medications on board

Change any one and the experience changes with it. Your limit with each substance alone tells you little about the two together.

When drinking and using cannabis stops feeling optional, Reach Recovere helps you find treatment that fits and find ways to pay for it.

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Short-Term Risks of Mixing Weed and Alcohol

Two things go wrong fast: you get more impaired, and you tend to consume more. Combined use produces greater impairment than either substance alone, a finding that goes back decades (Chait & Perry, 1994). On a given night that looks like dizziness, nausea, vomiting, sweating, spiking anxiety, paranoia, and the impaired judgment that leads to choices you’d never make sober.

Increased Impairment and Impaired Driving

Do not drive after mixing weed and alcohol. The combination wrecks the exact skills driving depends on.

Coordination, reaction time, memory, and the ability to track a lane all degrade. In a controlled driving-simulator study, a blood THC level of 20 micrograms per liter increased lane weaving by about 16 percent, comparable to the effect of a 0.10 breath-alcohol level, and the two together produced additive impairment (Hartman et al., 2015).

The crash data are starker. A case-control analysis of fatal motor-vehicle crashes found the adjusted odds of being involved in a deadly crash were 16 times higher for drivers who’d used alcohol, about 1.5 times higher for cannabis, and roughly 25 times higher when both were present (Chihuri & Li, 2017). People who use the two simultaneously are also about twice as likely to report driving drunk compared with people who only drink (Subbaraman & Kerr, 2015).

Cannabis can mask the feeling of being drunk, so you may feel steadier than you are. Using more than one impairing substance, alcohol included, can amplify the impairing effect of each (NHTSA). Arrange a ride before you start.

Drinking More Than You Realize

Cannabis can dull the physical feedback that normally tells you to slow down. Less stumbling, less spinning, fewer of the usual cues, so the drinks keep coming. The result is heavier drinking, and at the far end, alcohol poisoning.

One standard drink in the U.S. contains about 14 grams of pure alcohol, the amount in a 12-ounce beer, a 5-ounce glass of wine, or a 1.5-ounce shot (NIAAA). Your body clears it at a fixed pace, roughly one standard drink per hour, and nothing speeds that up. Binge drinking, defined by the NIAAA as four or more drinks for women or five or more for men in about two hours, brings blood alcohol to 0.08 percent and gets there faster than most people think (NIAAA).

What to know: track your drinks When cannabis is masking the buzz, your own judgment is an unreliable counter. Keep a running tally of drinks in your phone, and count an edible or a heavy session as another reason to stop drinking earlier than usual.

Long-Term Risks of Combining Weed and Alcohol

The risks don’t end when the night does. Regular co-use builds its own problems over time.

Higher risk of dependence. People who use both tend to use more of each, and use more often, than people who use one alone. A review of the research found co-use associated with heavier, more frequent consumption and a greater likelihood of substance use and mental health disorders (Yurasek et al., 2017). More exposure to both substances means more chances for dependence on either to take hold.

Cognitive and brain changes. Sustained combined use is linked to reduced cognitive functioning and structural changes in brain regions like the hippocampus, effects more pronounced than those from either substance on its own, according to an evidence review from Public Health Ontario.

Mental health. High doses of cannabis can trigger acute anxiety, panic, or, rarely, a temporary psychosis with hallucinations, and the risk is higher for young people and those already vulnerable to psychotic disorders (NIDA). Layering heavy alcohol use on top compounds the strain on mood and sleep.

Cutting back on one substance isn’t safer if you lean harder on the other. Alcohol and cannabis act as both substitutes and complements, and reducing one doesn’t reliably reduce overall harm (Subbaraman, 2016).

What Is "Greening Out" (Getting "Cross-Faded")?

Greening out is the body’s reaction to too much THC: a wave of nausea, dizziness, and anxiety that can leave you pale, sweaty, and shaking. “Cross-faded” means drunk and high at once. That’s the state that makes a green-out more likely.

Mixing alcohol raises the odds because, as the research shows, alcohol drives blood THC higher and faster than cannabis alone. Typical symptoms:

  • Nausea and vomiting
  • Dizziness or “the spins”
  • Pale skin and sweating
  • Rapid heartbeat
  • Anxiety, panic, or paranoia

On its own, greening out is rarely dangerous. It passes. Its symptoms overlap with the early signs of alcohol poisoning, though, so when alcohol is involved you can’t assume every bad reaction is “just” a green-out (MedlinePlus).

How Long Does Greening Out Last?

A green-out usually lasts from a few minutes to a few hours, depending on the dose and how the cannabis was taken. Smoked or vaped cannabis produces effects that generally run one to three hours; edibles last much longer, sometimes most of a day (NIDA). A lingering “weed hangover” of grogginess and fog can stretch into the next day.

While it passes, a few things genuinely help:

  • Lie down somewhere quiet and dim
  • Sip water
  • Eat something light to steady blood sugar
  • Stay calm; remind yourself it’s temporary
  • Have a sober person stay nearby

Other Slang Terms for Mixing Alcohol and Marijuana

The vocabulary shifts by region and generation, but the meaning is the same: using both at once.

  • Cross-faded: the most common term for being drunk and high together
  • Twisted: intoxicated on both
  • Crunk: a blend of “crazy” and “drunk,” often with cannabis in the mix
  • Faded / double faded: high, or high and drunk
  • Lit and loaded: under the influence of both
  • Zooted: heavily intoxicated

How To Handle a Bad Reaction

Most bad reactions to being cross-faded aren’t emergencies, and they end on their own:

  1. Stay calm. Panic makes nausea and a racing heart worse. The feeling will pass.
  2. Sit or lie down. Pick somewhere quiet with low light, and stop using anything more.
  3. Hydrate. Small sips of water. Skip more alcohol and caffeine.
  4. Raise your blood sugar. A few crackers, juice, or fruit can ease lightheadedness.
  5. Get a sober buddy. Having someone stay with you matters, especially if drinking was heavy.

Folk fixes like sniffing black peppercorns or chewing lemon rind circulate widely, and some people swear by them, but the evidence is thin. They won’t hurt; just don’t count on them.

A green-out and alcohol poisoning are different. If someone is barely conscious, vomiting repeatedly, breathing slowly or irregularly, or cold and clammy, that’s not a green-out.

How To Reduce the Risks (Harm Reduction)

The safest option is not to combine weed and alcohol at all. It’s the one choice with no downside. If you’re going to use both anyway, these steps lower the risk:

  • Go low and slow. Smaller amounts of each, spaced out. You can always have more; you can’t undo too much.
  • Space them apart. Your body clears about one standard drink per hour. Give alcohol time before adding cannabis.
  • Eat first and hydrate. Food slows alcohol absorption; water paces you.
  • Be careful with edibles. Delayed onset plus alcohol is the most unpredictable combination. Wait before redosing.
  • Set a limit before you start. Decide your cap while you’re still sober enough to mean it.
  • Keep a sober friend in the loop. Someone who can step in if a night goes sideways.
  • Never drive. Arrange the ride home in advance.

One caveat on a popular idea. Because using cannabis first can lower how much you drink, some people treat it as a safety hack. It isn’t. The added impairment, the masking effect, and the dependence risk outweigh any reduction in alcohol intake (Subbaraman, 2016).

Can You Overdose on Alcohol and Marijuana?

You can’t fatally overdose on cannabis alone, but you absolutely can on alcohol, and mixing the two makes alcohol poisoning more dangerous.

A cannabis “overdose” means taking enough to feel sick and scared: intense anxiety, a pounding heart, sometimes temporary paranoia or hallucinations (NIDA). Unpleasant, yes. Deadly on its own, almost never.

Alcohol is a different story. Alcohol poisoning shuts down the parts of the brain that control breathing, heart rate, and temperature, and it can kill (NIAAA). THC has a well-documented anti-nausea effect, the same property that makes cannabis-derived medications useful against chemotherapy sickness (National Cancer Institute). Vomiting is one of the body’s defenses against a toxic dose of alcohol. If cannabis suppresses that reflex, alcohol can keep climbing while the warning sign is muted. That’s a plausible, serious risk, even though it’s hard to measure directly.

How To Recognize Alcohol Poisoning

Alcohol poisoning is a 911 emergency. Per the NIAAA, the warning signs are:

Call 911 if you see:
  • Mental confusion or inability to stay awake
  • Vomiting
  • Seizures
  • Slow or irregular breathing
  • Slow heart rate
  • Clammy skin or a pale, bluish tint
  • Low body temperature
  • Dulled responses, such as no gag reflex

Don't let someone "sleep it off" if these signs are present. Stay with them, turn them on their side to prevent choking, and call for help (NIAAA).

Is It Safe To Mix CBD and Alcohol?

Combining CBD and alcohol is best avoided unless a clinician says otherwise. CBD is the non-intoxicating compound in cannabis, so it won’t get you high the way THC does. That doesn’t make the pairing risk-free.

Sedation is the clearest concern. The FDA warns that using CBD with alcohol, or with other substances that slow brain activity, raises the risk of drowsiness and sleepiness, which can lead to falls and injuries (FDA). One early human study found the pairing produced significant motor impairment.

Then there’s the liver. CBD can cause liver injury, the FDA says, and heavy drinking taxes the liver too; together, the effect isn’t well understood (FDA). You’ll see claims that CBD blunts alcohol’s effects or curbs drinking. That evidence is mostly from animal studies, not people. Far from settled.

Weed vs. Alcohol: Which Is Worse?

Neither is safe. They’re harmful in different ways. Alcohol carries the higher risk of acute, fatal harm: you can die from an alcohol overdose, and the World Health Organization’s position is that no level of alcohol consumption is safe for health (WHO). A fatal cannabis-only overdose is essentially unheard of.

That doesn’t make cannabis harmless. Both substances impair driving, both can lead to a substance use disorder, and both carry mental health and cognitive risks with heavy use.

Weed vs. Alcohol: Comparing the Risks
Dimension Alcohol Cannabis
Fatal overdose Yes. Alcohol poisoning can be deadly. Essentially never from cannabis alone.
Driving impairment Major; a leading cause of crash deaths. Real and significant; lower than alcohol alone, worse when combined.
Addiction potential Can lead to alcohol use disorder. Can lead to cannabis use disorder.
Long-term health No safe level; raises cancer and organ-damage risk. Cognitive and mental health risks, especially with heavy or early use.
Combined Together, both are worse than either alone.

When To Get Help

Using weed and alcohol together doesn’t automatically mean there’s a problem. The change to watch for is when use stops feeling optional. Signs it’s crossed that line:

  • Strong cravings for one or both
  • Trying to cut down and not being able to
  • Needing more to get the same effect
  • Using in situations where it’s dangerous
  • Letting work, relationships, or responsibilities slide
  • Continuing despite clear harm

Co-occurring use of both substances is common and treatable, and reaching out earlier tends to lead to better outcomes. Treatment can address both at once rather than trading one dependence for another.

Help is available, and your search is confidential. Find treatment that fits your life and your budget through the Reach Recovere directory.

Search the Reach Recovery Directory

You can also reach SAMHSA’s free, confidential National Helpline at 1-800-662-HELP (4357), available 24/7 in English and Spanish.

Medical disclaimer This article is for informational purposes and is not a substitute for professional medical advice, diagnosis, or treatment. If you have questions about your health or substance use, talk with a qualified healthcare provider. In an emergency, call 911.

Frequently Asked Questions

How long does greening out last?

Usually a few minutes to a few hours. Smoked or vaped cannabis tends to peak and fade within one to three hours, while edibles can last most of a day. Rest, water, and a small snack help while it passes.

Is it worse to be drunk or high?

Alcohol carries the higher risk of fatal overdose, and the WHO says no amount is safe for health. Cannabis rarely causes a fatal overdose but isn't harmless. Using both together is worse than either alone.

Can you mix CBD and alcohol?

It's best avoided unless a clinician advises it. CBD won't get you high, but combined with alcohol it can increase drowsiness and fall risk, and the FDA warns CBD can stress the liver.

Does weed help a hangover?

There's no good evidence that it does. Cannabis may mask nausea or a headache temporarily, but it doesn't speed alcohol clearance, and adding it can prolong grogginess into the next day.

Can you get alcohol poisoning while high?

Yes, and it may be more likely. Cannabis can blunt how drunk you feel, leading to extra drinks, and THC's anti-nausea effect may suppress the vomiting that would otherwise warn you. Watch for the 911 signs above.

Is it safe to mix weed and alcohol at all?

No combination is truly safe. The safest choice is not to mix them. If you do, use less of each, space them out, never drive, and keep a sober friend nearby.

Sources

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  4. Subbaraman MS, Kerr WC. "Simultaneous versus concurrent use of alcohol and cannabis in the National Alcohol Survey." Alcoholism: Clinical and Experimental Research. 2015;39(5):872–879. ncbi.nlm.nih.gov/pmc/articles/PMC4427543
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Patrick Bailey

I am a professional writer, mainly in the fields of mental health, addiction, and living in recovery. I attempt to stay on top of the latest news in the addiction and the mental health world and enjoy writing about these topics to break the stigma associated with them.

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