Weed and Alcohol: What Happens When You Mix Them
Most people who use cannabis have also had alcohol at some point, and plenty have combined the two, at a party, on a patio, at a concert, or just over a slow weekend evening. The combination is common enough that it has its own slang: crossfaded.
What is less common is a clear-headed account of what is actually happening when you combine them, why the experience can go sideways so quickly, and what the research says about using both together over time. This article covers that.
The Core Pharmacological Interaction
The most important thing to understand about alcohol and cannabis together is that their interaction is not simply additive. They do not just produce two highs at once.
Alcohol increases THC absorption
A study by Lukas and colleagues, published in Clinical Pharmacology & Therapeutics, found that drinking alcohol before using cannabis significantly increased peak blood plasma levels of THC compared to using cannabis alone. The mechanism involves alcohol increasing the permeability of the gastrointestinal tract, which accelerates how quickly THC is absorbed into the bloodstream.
In practical terms: drinking before consuming cannabis makes the cannabis hit significantly harder and faster than it would on its own. What feels like a manageable dose of cannabis in isolation can become overwhelming when alcohol has been consumed first.
The reverse is also meaningful
Using cannabis before alcohol appears to slow the rate at which the body absorbs alcohol, a finding consistent with cannabis's effect on gastrointestinal motility. This means people using cannabis before drinking may not feel as intoxicated from alcohol as their blood alcohol content actually warrants, potentially leading them to drink more than they realise.
Neither direction of use is safe in the way that using either substance alone at a moderate dose can be considered safe. The interaction amplifies the effects and risks of both.
What Crossfading Actually Feels Like
The term crossfaded, being simultaneously drunk and high, was studied in a survey of over 800 young adults, with 87% of participants reporting they had heard the term and most describing it as using alcohol and cannabis at the same time. Most participants rated it as moderately risky.
The experience varies significantly between individuals. Common descriptions include:
The spins
A sensation of spinning or disorientation, similar to but more intense than alcohol-induced vertigo. This is more common when significant alcohol has been consumed before cannabis.
Amplified anxiety or paranoia
Cannabis-induced anxiety, which is already more likely at high doses or with high-THC products, can be significantly intensified when alcohol is also present.
Nausea and greening out
The combination is one of the more reliable triggers for cannabis overconsumption nausea. Someone who can usually handle a given cannabis dose without issue may find it produces nausea when they have also been drinking.
Impaired judgment about impairment
This is the most consequential effect. Both substances impair the ability to accurately assess your own level of intoxication. Together, that impairment compounds. People who combine cannabis and alcohol consistently report being surprised by how impaired they are.
What the Research Shows
- Several studies have examined the consequences of using cannabis and alcohol together, and the findings are reasonably consistent.
- Researcher Meenakshi Subbaraman and colleagues published multiple studies, in 2015 and 2017, examining simultaneous versus separate alcohol and cannabis use in large samples of adults. The research found that people who used both substances at the same time, rather than separately, had significantly higher rates of alcohol-related harms: more impaired driving incidents, more adverse health outcomes, and greater alcohol consumption overall.
- People who used both substances but kept them separate, cannabis on one occasion, alcohol on another, did not show the same elevated risk profile as those who combined them simultaneously.
- A 2011 study examining cognitive performance found that combining alcohol and cannabis produced worse performance on cognitive tasks than either substance alone. The effect was not simply the sum of the two impairments. It was compounding.
- A 2020 study published in Frontiers in Psychiatry found that higher-THC cannabis products were associated with more frequent simultaneous use with alcohol, suggesting that potency plays a role in how the combination behaves.
- None of these studies constitute a reason to never combine the two. They do constitute a reason to understand what you are getting into when you do.
Does the Order Matter?
Yes. The order in which you use each substance changes the experience meaningfully.
Alcohol before cannabis
Is the higher-risk direction. Alcohol increases THC absorption, which means the cannabis hits harder than expected. People who drink before using cannabis are more likely to experience greening out, intense paranoia, or disorientation than people who use cannabis without alcohol present. This combination also most reliably produces the spins.
Cannabis before alcohol
Is somewhat different but carries its own risk. Because cannabis can slow the subjective feeling of intoxication from alcohol, people may drink more than they intended without realising it. The result is a higher blood alcohol content than expected, which tends to arrive as a delayed wave rather than a gradual build.
Neither sequence is safe in a "use this one and you will be fine" sense. But the alcohol-first direction tends to produce more acute discomfort, while the cannabis-first direction more commonly produces underestimated intoxication from alcohol.
Driving: The Non-Negotiable
Both cannabis and alcohol impair driving. Combining them significantly compounds that impairment.
California law prohibits driving under the influence of cannabis, alcohol, or any combination of both. Unlike alcohol, there is no per se THC limit in California. Impairment is assessed through field sobriety testing and Drug Recognition Evaluators. But the practical standard is the same: driving while meaningfully impaired by either substance is illegal and dangerous.
Research consistently shows that simultaneous use of alcohol and cannabis increases impaired driving risk significantly more than either substance alone. A 2013 study found that simultaneous cannabis and alcohol use roughly doubled the odds of driving while impaired compared to alcohol use alone.
If you have used both, arrange an alternative way to get home. This is not a general wellness recommendation. It is a specific safety point. Cannabis delivery to your home from a licensed service like Smoakland means you never need to drive to acquire cannabis in the first place, but the driving rule applies regardless.
The Sober-Curious Middle Ground
One pattern worth noting: some California adults consciously use cannabis as a partial alternative to alcohol in social situations, not a complement to it. Low-dose edibles or a mild sativa vape at a gathering where others are drinking is a different use case from actively mixing the two.
This approach, cannabis instead of alcohol rather than alongside it, is not the same thing as crossfading. Keeping them genuinely separate, including in timing, avoids most of the interaction effects described above. The concern is simultaneous or near-simultaneous use, not the fact of using both substances at different points in your life.
Smoakland's low-dose edible options, Sway Singles at 10mg, El Sol 100mg gummy packs portioned small, suit the "social cannabis instead of another drink" approach better than high-potency flower or concentrates, precisely because the dose is controllable and the experience predictable. See the full edibles range for current options.
Practical Guidance: If You Are Going to Combine Them
If you are going to use both cannabis and alcohol in the same evening, a few considerations that reduce the likelihood of a difficult experience:
Start with less of each than you would use separately
The interaction amplifies both substances. Half the cannabis you would normally use and half the alcohol is a more appropriate frame than treating each as independent.
Avoid using cannabis after significant alcohol consumption
This is the direction most reliably associated with greening out and acute discomfort. Using cannabis first, or keeping a meaningful gap between alcohol and cannabis, reduces the absorption interaction.
Choose lower-potency cannabis
A 30–39% THC Black tier flower after several drinks is a significant risk for an uncomfortable experience. The same evening with a lower-THC product, a Rolliez pre-roll in the 22–24% range, or a single short vape draw, gives more margin.
Plan your transport in advance
Decide before you start how you are getting home, not after both substances are on board.
Know your individual response
The experience of mixing alcohol and cannabis varies meaningfully between individuals. Age, body weight, tolerance to each substance, what you have eaten, and genetics all play a role. What your friend handles easily may hit you very differently.
Frequently Asked Questions
What happens when you mix weed and alcohol?
Alcohol increases the absorption rate of THC, meaning cannabis hits harder and faster when you have been drinking. Cannabis used before alcohol can mask how intoxicated you are from the alcohol, leading to drinking more than intended. Together, the two compounds impair judgment, coordination, and cognitive function more than either alone. The combination is more reliably associated with nausea, anxiety, and disorientation than either substance used separately.
Does alcohol make weed stronger?
Yes, in a specific pharmacological sense. Drinking before using cannabis increases peak THC blood plasma levels, making the same dose of cannabis produce more intense effects than it would on its own. Research by Lukas and colleagues found this effect with alcohol consumed before cannabis use. The reverse does not apply in the same way. Cannabis does not straightforwardly make alcohol stronger, but it can mask the subjective sense of intoxication from alcohol.
What is crossfading?
Crossfaded is a widely understood term among young adults for simultaneously using alcohol and cannabis. A study of over 800 participants found 87% had heard the term, with most describing it as the state of being both drunk and high at the same time. It is associated with higher rates of alcohol-related harms and impaired driving risk compared to using either substance separately.
Is it safe to mix weed and alcohol?
Research suggests that simultaneous use of cannabis and alcohol is associated with more harms than using either substance separately. These include increased impaired driving risk, worse cognitive performance, and higher rates of alcohol-related problems. Using each occasionally and separately carries a different risk profile than combining them simultaneously. If you choose to use both, using less of each and avoiding alcohol before cannabis reduces the acute risks.
Can you drive after mixing weed and alcohol?
No. California law prohibits driving under the influence of cannabis, alcohol, or any combination. Research shows that combining the two significantly increases impaired driving risk compared to either substance alone. If you have used both, arrange alternative transport.
Why does mixing weed and alcohol make you feel sick?
The nausea associated with mixing alcohol and cannabis, sometimes described as greening out, results from the interaction between both substances and the body's nausea-regulating systems. Alcohol on its own can cause nausea. High-dose cannabis can also trigger nausea, particularly via edibles. Combined, and particularly when alcohol was consumed first, the effect can be pronounced. Eating before using either substance, staying hydrated, and keeping doses low all reduce the risk.
Cannabis and alcohol are both legal for adults 21 and over in California. Using them simultaneously is not illegal, but it is worth knowing what the combination actually does, and making that a considered choice rather than an accidental one.
This content is for informational purposes only and does not constitute medical or legal advice. Cannabis affects individuals differently. Never drive under the influence of cannabis, alcohol, or any combination. Must be 21+ to purchase cannabis in California. Smoakland complies with all applicable California cannabis regulations. License #C9-0000075-LIC, C9-0000655-LIC, C9-0000174-LIC.