My old city I just middled through childhood friends.
Get a retail or service job lol. 9/10 times if you’re cool then someone will eventually ask “hey do you smoke?” If you seem uptight and adhere to le rules based order of the company, then they will probably not say anything to you.
However people will usually only mention weed. You may have to deliberately mention other drugs if you want to seek it out.
I should note that I am young, so my age may have been a factor because most of the coworkers who brought this up were either around the same age or younger. There were a couple older guys who also asked me, but that’s because the nature of our work got us in contact with drugs frequently.
Alternatively you can also probably ask your friends for connections. Someone is bound to know a guy who knows a guy who knows a guy from three states over who knows another guy in your city.
last time I tried this I got a weird look and told “not around here”. In fairness, I give off uptight vibes and follow the rules because covering my ass on the easy stuff lets me uncover my ass on the stuff that actually matters (stealing like 5-10 minutes every shift).
