Holiday parties usually come with a drink in one hand, and for some people, cannabis in the other. It is a common combination, and it is one of the riskier ones. This guide explains what recent research says about mixing cannabis and alcohol, why edibles deserve extra caution, and practical ways to keep a holiday party enjoyable and safe. It is general information, not medical advice. It is for adults 21+.
The Quick Answer
- The safest choice is one or the other, not both.
- Together, they can impair you more than either alone, and for longer.
- Never drive after using either, and certainly not both.
- If you do choose cannabis, start low and pace yourself.
What the Research Says
A controlled study from Johns Hopkins Medicine, published in JAMA Network Open in May 2026, tested adults in a driving simulator and on other measures after they had cannabis brownies (10 or 25 mg THC), alcohol, both or a placebo. It found that combining edibles and alcohol produced greater and longer-lasting driving impairment and a stronger feeling of intoxication than either alone. The lead author said the interaction may be synergistic, not just additive. The study was small, with 25 participants completing every visit, so it is one piece of evidence, not the final word. Still, it points in the same direction as other research on co-use and crash risk.
The study also found that standard field sobriety tests did not flag cannabis, alone or with alcohol. That means you can’t rely on feeling fine, or on passing a roadside test, to know you are safe to drive.
Why Parties Make It Harder
- Edibles are slow. People take a second one because they don’t feel the first, and then both arrive together. See edible dosing.
- Drinks add up quickly, and a cocktail’s strength is hard to judge.
- Judgment gets worse first. That is when people decide to have another round or to drive.
- Food and sleep matter, and parties often mean neither.
If You Choose Cannabis at a Party
- Pick cannabis or alcohol, not both.
- Start with a very low dose, and wait. For edibles, that means hours, not minutes. See microdosing.
- Know what you are taking. Use licensed, labeled products. See how to read a cannabis label.
- Drink water and eat food.
- Don’t accept anything unlabeled. Ask what is in a brownie before you eat it.
If You Choose Alcohol
Skip cannabis for the night, including at the end of it. Using cannabis after drinking, or the other way around, is the situation the research is about.
Getting Home
- Plan your ride before the party starts. Rideshare and PATH are both options in Jersey City.
- Pick a designated driver who uses neither.
- Stay over if you can.
- Remember the penalties for impaired driving in New Jersey are the same for cannabis as for alcohol. See New Jersey cannabis laws.
If You’re Hosting
- Offer non-alcoholic drinks and plenty of food.
- Label anything with cannabis in it, or don’t serve it.
- Make sure anyone using cannabis is 21 or older.
- Lock your own products away. See our hosting guide.
- Don’t let a guest who has been using drive.
Signs to Take Seriously
If someone seems very unwell, is unresponsive, has trouble breathing or is in distress, call 911. For questions about an accidental overdose, call Poison Help at 1-800-222-1222. Don’t wait to see if it passes.
For New Year’s Eve
The same advice applies on the biggest party night of the year. See our New Year’s Eve planning guide.
FAQ
Is it safe to mix weed and alcohol?
Research suggests the combination can cause more impairment, for longer, than either alone. The safest choice is one or the other.
Can I drive if I feel fine?
No. Feeling fine isn’t a reliable test, and impairment can last longer than you expect.
Are edibles worse with alcohol?
The Johns Hopkins study looked at edibles specifically and found greater, longer-lasting impairment when they were combined with alcohol.
Shop CREAM
Browse the menu or call (848) 500-9333. CREAM is at 284 1st Street, Downtown Jersey City. Adult-use only — 21+ with valid ID. Please consume responsibly and never drive after using cannabis.