actually one of the funny things about drug use in old stories is they haven't figured out the Advanced Legal Classification Of Which Drugs Are Bad like we have, so a character who can smoke tobacco and weed and opium and maybe snort a little coke on the side and it's kind of all treated as being much the same thing, or perhaps the coke is treated as a harmless vice like adderall while the tobacco is a little disreputable, even.
Powder cocaine was very much considered a “soft drug” like weed and unlike say heroin (with pharmaceuticals their own thing) in the late ‘70s/early '80s (but then there was freebasing)