When it comes to drugs, alcohol and weed are among the most commonly used substances. But what really happens when they team up?
Occasionally mixing alcohol and weed — also known as crossfading — likely won’t lead to major health problems. But there are a lot of variables to consider, including which one you use first and how you consume them.
If you aren’t careful, the duo can lead to a case of the spins or a green out, two reactions that can turn a fun night out into a nauseated night in.
It’s also important to remember that people can have very different reactions to the same mix of alcohol and weed. If you’re out in a group, one person’s reaction might be very different than yours.
Read on to learn more about the potential reactions and what to do if you have a bad one.
Drinking before using weed can intensify weed’s effects. This is because alcohol increases the absorption of weed’s main psychoactive ingredient, delta-9-tetrahydrocannabinol (THC).
This generally results in a stronger high. While this might be nice for some folks, it can cause others to green out. This refers to a range of unpleasant physical symptoms that can result from a strong high.
Symptoms of a green out include:
Breaking down the research
Turns out, you might not need much alcohol to change the way your body absorbs THC.
In a 2015 study, 19 participants drank either a placebo or small amount of alcohol. Ten minutes later, they used a vaporizer to inhale either a low or a high dose of THC.
The researchers found significantly higher peak THC levels among participants who had alcohol versus those who had a placebo. This was true for both low and high doses of THC.
However, this study was pretty small, making it hard to draw any firm conclusions. Plus, a similar (but equally small)
While there’s some research around the effects of drinking alcohol before using weed, there isn’t much about the opposite approach. The studies that do exist are old and mostly inconclusive.
For example, a
Weed appeared to slow down the rise of blood alcohol levels after consuming a high dose of alcohol. But a
If using weed does indeed slow the absorption of alcohol, it might also delay feelings of drunkenness. This might seem like a good thing, but it makes it harder to know how impaired you really are.
For example, you might feel like you’re good to drive, but your blood alcohol level may be well over the legal limit.
It’s hard to say. There’s isn’t a ton of high-quality research on the topic. Still, there’s some evidence to suggest that regularly combining alcohol and weed may have some concerning effects over time.
Higher risk of dependence
Decreased cognitive function
Those who consumed just alcohol had worse cognitive functioning than those who only consumed THC. Those who combined the two had reduced cognitive performance than those who only consumed alcohol.
Over the long term, combining alcohol and weed may be associated with decreased cognitive function and changes in brain structures, such as the hippocampus.
A number of recent studies also focus on how combining weed and alcohol affects your driving.
The researchers reported that combining THC and alcohol consistently impaired driving performance, with worse performance during nighttime simulations.
Adding alcohol to a low dose of THC impaired driving simulator scores by 21 percent. Adding alcohol to a high dose of THC impaired driving simulator scores by 17 percent.
The big takeaway? Don’t drive after using marijuana or drinking alcohol. Period.
When mixing weed and alcohol, there are a lot of other variables to consider in addition to which one you use first.
- your tolerance to either substance
- the type and strength of the alcohol
- whether you smoke, vape, or take edibles
- the time interval between taking each substance
- whether you also use other substances, including tobacco or caffeine
- whether you take medication
The safest bet is to avoid using weed and alcohol together. But if you do decide to mix the two, start slow and keep track of how much you’re consuming of each. Keep a running tab in your phone, if you have to.
Remember, consuming weed and alcohol together can make you feel either more or less intoxicated than you would if you were using just one or the other.
If you take medication, talk to your doctor before using weed, alcohol, or both. They may weaken the effectiveness of your medication or increase your risk for certain side effects.
If you’ve mixed weed and alcohol and are having a bad reaction, it’s probably because alcohol seems to make the high from using weed stronger. The resulting unpleasantness is casually known as a green out. This can happen any time you’ve consumed to much weed — with or without alcohol.
Signs of a green out can include:
- rapid heart rate
- stomach problems
- nausea and vomiting
Usually, a bad reaction to mixing weed and alcohol will pass within a few hours. You may even wake up with some lingering effects the next day.
But if you’ve been drinking a lot, it might be hard to tell the difference between a green out and alcohol poisoning, which can be life-threatening if not treated.
Both weed and alcohol, together and on their own, are also potentially addictive and can lead to dependence and misuse.
Contact your healthcare provider or call the Substance Abuse and Mental Health Services Administration (SAMHSA) hotline at 800-662-4357 if you find yourself dealing with:
- lack of control over how much you consume
- anxiety, restlessness, or negative thoughts when sober
- irritability and moodiness
- disinterest in other activities
- changes in appetite and sleep patterns
- difficulty fulfilling obligations
- consuming even when it’s risky
- trying and failing to quit
It might seem harmless to mix alcohol and weed, but doing so can be a slippery slope toward getting overly intoxicated.
If you want to mix the two, pay careful attention to how much of each you’re consuming, especially if you’ve never mixed them before.
Keep in mind that combining the two may be linked to a decline in cognitive function and an increased risk of dependence.