All of this comes back on personal responsibility. Abuse of any intoxicant, or consuming enough of anything, alcohol or drugs, which impair us, is bad. I think we can all agree on that. I hope we can all agree on that.
As I wrote, adults can do any stupid damn thing they want, as long as it doesn’t involve public intoxication (or non-drug crimes such as assault, murder, theft, etc.). Nevertheless, I don’t support drug use or drug laws (other than as relate to minors.)