Laws which proscribe actions affecting no one other than the person doing it are queer things.
The government isn't your daddy. It doesn't exist to make decisions for you, as if you're a child incapable of making your own.
When it's a law supporting the decision someone would have made on their own, such as not using drugs, people promptly miss the point and support the law. Hey, dumbass. Can you not see that it isn't the law itself you're agreeing with? You're agreeing with the government's position that it will decide things for you, and you don't get to decide things for yourself. I'm not on board with that at all.
"The government deciding for you and protecting you from yourself" is going to be the principal point of contention for the next four years. Whether you agree with it is something you should contemplate.