Since opium dens fell out of favor, the only psychoactive substances that have dedicated social spaces are booze (bars, nightclubs) and nicotine (hookah lounges, cigar clubs). This could change, but it hasn't yet. It sure seems like society's just swinging antisocial.

Raves, (some) nightclubs, and music festivals are the equivalent for MDMA/ket/psychedelics and there are plenty of options in every city.

> the only psychoactive substances that have dedicated social spaces are booze (bars, nightclubs) and nicotine (hookah lounges, cigar clubs)

caffeine (cafes)

Maybe it's just where I live, but cafes and coffee shops no longer have the expectation of being open to conversation with strangers.

There are also teahouses in some cities.

And also, a decent chunk of alcohol consumption must be solo? I'd bet alcohol is broadly more social, but I would also wonder if that would change if more public gathering places served weed in some form.