The main point I see is that government is using coercion to attempt to control what people possess and consume. This is doomed to failure as people will and have always assumed they own their own bodies and they will self-medicate as they see fit no matter what the government says. Ok, maybe some people will be cowed by threats or brainwashed by propaganda to accept government control of their bodies, but a significant proportion will not acquiesce.

I think Lysander Spooner summed it up best in his essay Vices Are Not Crimes.