The difference between the three substances and weed is that those three substances have no other purpose but to harm others. Weed smokers only harm themselves.
None of my four 'drugs of choice' are harmful to anyone, unless I would apply them.
Also, weed smokers create an economy as I said (free or "black market") that corrupts others. (seen the ads on TV lately?) It also dissipates one's well-being IMHO and that's a "bummer."
Enough for now! This posting is getting... downright... addicting!
But unlike them,it's damn near impossible to apply marijuana to an unwilling victim---nor have I ever heard of anyone trying.
How is that any less true of alcohol?
Just about any weed smoker I have ever known would cheerfully grow a pot plant in their living room, if it were legal. The black market in pot exists solely because pot is illegal, not because of the nature of pot, just as Prohibition created a black market in alcohol where none existed before.
In fact, your beloved ban on pot has in many ways made drug use among teens and young adults worse. Since pot is bulky and difficult to smuggle, the cost has skyrocketed. The price of heroin, however, a compact substance easy to smuggle, has dropped, and its purity risen. So congratulations. Your approach has resulted in making heroin accessible and affordable around the country. Hope you're happy.