That’s a bit of a false dilemma though. The two options aren’t “it’s a magical elixir with absolutely no downsides” and “people deserve to be locked in a cage and have their life ruined for possessing it”. Plenty of legal things can cause harm. 35% of people are lactose intolerant, do we ban dairy?

How exactly do you define advertising? An overly broad definition would forbid, for example, a dentist from putting a sign in front of their office saying they’re a dentist.