I think drug use is a spectrum from caffeine and alcohol and pot on one side, and meth and cocaine and heroin on the other side, and in the middle there are a whole lot of drugs that are potentially dangerous or problematic if misused, but could offer benefits if used responsibly. I don't think we necessarily need a strong social stigma against pot or drinking (within reason), but we probably need one against using meth and opiates recreationally -- and I think there _is_ one that has never gone away. People even today keep that kind of drug use on the down low if they aren't deep into drug culture or an out of control addict.

A random coworker might talk to you about some new strain of pot they found, but they definitely aren't going to talk to you about heroin they shot up last weekend that they bought on a street corner.