While I’m not and would not propose the drastic measures that Singapore or Japan take, but there is much less drug use in those two places among others and they prove that enforcement, if you’re willing to address the problem, can greatly reduce use of illegal drugs.
Meth is very addictive and debilitating. It’s worse than crack. It takes people down. They are no longer able to be productive citizens. They become a burden for families and for society.