Obviously it’s too simplistic. I didn’t write a fucking law about it that needs to be perfect. This is a casual internet forum, and everyone knows that a statement like that isn’t literal. Anything you do has some public risk, that we find acceptable.

A tanning bed doesn’t though, besides potentially starting a fire, or things like that which we don’t need to factor in here. Similarly, most drugs only harms yourself. Yes, there’s some amount that ends up in the water supply, and distribution can cause harm (as is true for literally everything). The outside dangers are insignificant though and we do not need to discuss them further. If you want a more specific wording, “adults should be able to do what they want as long as the harm to others is below a socially acceptable threshold.”