Yes. There are laws in some countries for example that make the advertising of Tobacco illegal. That's a form of censorship people can say is reasonable, but it can also be a slippery slope towards harsher censorship around other things people might find harmful - the female body, sugar, gambling, abortion, meat, etc.

The question is if you want to give the government such a broad spectrum to censor, in which they'd start judging whether or not a product might be deemed potentially harmful.