I feel your pain (and paranoia). The apartment complex I live in has a "drug free" clause in the contract. That is: many of the older people who live here, who have chronic pain, can talk in the hallways about how the pain meds they get from their Big Pharma Pushers (their doctors) cause the side effects of nausea or hives or oozing sores. Those drugs are OK. But if they use mmj they can be evicted.

Probably best to simply not mention it, and if you are adverse to alcohol simply have a private word with the bartender to keep you supplied with "virgins" of whatever the group is drinking.

Interesting counterpoint, though, and food for another thread, perhaps:

The wife and I went to a restaurant a while back. I had just gotten my mmj license and we were quietly talking about using mmj for our cat's arthritis. The guy sitting next to us overheard, and got involved, in a very friendly and intelligent way, in our conversation. We three discussed medical marijuana, possible benefits, dosages, the issue of lab-testing, mmj success stories reported in the MSM, etc.

Our three-way conversation was therefore a little more audible, and I noticed that a middle-aged couple nearby was listening. I'm pretty good at reading body language and noted that they - initially - had high disapproval. Over about 15 minutes, however, the disapproval postures faded and were replaced by "interest" and "learning" postures.

What had happened, I think, is that the couple had been confronted with a trope contradiction. Their learned (indoctrinated) stereotype of pot smokers as "shady, confused, long haired hippy freaks" had been challenged by social evidence to the contrary.

This suggests (if I may borrow a term from the 60s) that "guerrilla theatre" (Guerrilla theatre - Wikipedia, the free encyclopedia) might be a viable strategy in the battle for marijuana legalization. Or at least that portion of guerrilla theatre that consists of "spontaneous, surprise performances in unlikely public spaces to an unsuspecting audience." The satire, nudity and profanity of 60s-style theatre, however, should be left out.

The repeated "performances" of obviously intelligent, well-dressed, "everyday" people quietly discussing mmj would have a beneficial effect on public perception and, ultimately, voter approval.