Here (Europe) smoking isn't at all common, and snorting is usual. --Taw
In eastern Europe the most usual is injecting Methamphetamine. -- DA
I think, it would be good to agree on some common scheme to describe drugs, which could include (please improve and move to a better location - under Drug or even Pharmacology ?):
History
Chemistry
(ev. Biology)
Pharmacology (effects and mechanisms of action, including dangers due to behavioral change (as traffic accidents, aggressive beh. etc.))
Toxicology (harmful effects by the drug itself)
Accepted medical applications
Sociology - including all the non-medical apps. (common use in different socienties - of course, the medical apps. are a part of this also)
Law (globally)
-- DA