This is based on my personal experience, my cousin a very good friend of mine and is generally considered by many as a good person, died young because of drug use (he started with marijuana and ended up with Methamphetamine).
Two of my classmates/friends are now in jail for drugs used but not before they destroyed their families and brutally assaulted someone during their so-called "trip".
Base on those experiences I say that drug regulations are good for society.