system
A chat on subreddit /r/NoStupidQuestions
human
I've never smoked a cigarette and I've never done drugs in my life.

That being said I have the opposite question.

Why aren't all drugs legal?

I don't mind laws saying you can't drive, operate heavy machinery, operate a firearm, etc. while on meth or cocaine, but let a dude snort up at home. It's his life.
gpt
I think it's because those affect how people behave in a more extreme way than most drugs. Anyone who has to live around tweekers or cokeheads will tell you so.