I've heard of things like weed, lsd, shrooms, etc. being a "once in a while" or "once ever" type thing. Coke, meth, heroin, etc. arent really drugs that people do once in a while. Its almost unheard of. Every time i hear someone say they do one of those evil drugs every once in a while, i add, in my head "that you're willing to admit" or "that people know of".
Its probably b.s.