Sure, and people who drink alcohol never drive while intoxicated. Maybe we should try another Prohibition against alcohol since it worked so well the first time around.
It actually worked really well the first time, with a few exceptions.
However, where it wasn't strongly enforced, it lined the pockets of organized crime. And eventually during the great depression it was repealed to allow the government to reap the tax revenue.
The opposite extreme is to legalize even the hard drugs like LSD and Heroin, and super addicting drugs like the Chicago crack that if you survived the first hit you were addicted. Most people don't want complete legalization. We're just arguing over where to draw the lines.