Nothing with any ability to create addiction should be legally promoted. Maybe except sport, but in case of extreme sports as marathons too.
Or you can add requirement of being all addictions free for gaining legal voting rights.
If you can't be impartial in limiting oneself to natural human needs than you won't make impartial decision on behalf of whole nation, community, family.
It's crazy only army recruiting cares about such basic truths.
Humans are already born with incomplete free will, shaped by genes they didn't choose, origin they didn't choose and primed by their environment (starting with their first unique cell creation) constantly. You never become yourself not exercising being alone to discover & purify own identity.
Restricting it & priming body and mind to more subconscious, automatic reactions is corrupting people even more.
You want to help people grow and lift them up to control themselves (in body and mind) & self understanding not make them a drugged zombies.
Every bad stimuli is a step to accept higher dose of bad stimuli. Every addiction is breaking limits to other addictions.
While every good decision & stimuli opens door to more positive opportunities building positive habit. Self restraint helps you learn filtering urges surrounding you (and knowledging need to wipe them clean from around you) promoting clear thinking & conscious, priorities-driven decision making.
Nothing unnatural to human is natural to human ergo humane.
To know what inhumane you can tolerate without big harm you need to know the humane first to compare.
This basic intuition never betrayed me. And is infinitely profound.
USA is nation of living zombies. Majority is metabolically ill & drugged - in state of strong addiction to number of things.
Weed is less damaging than excess sugar in diet, non spieces proper diet in general or alcohol. Still any evil is evil. And so happens that most of it is promoted in shops through commerce & marketing without clear education about results of using it.
99% of what you are daily exposed to is priming you negatively & hijacking your "free" will.