That is not necessarily true. Alcohol and tobacco are legal and there are massive restrictions on how they are aloud to be advertised. The point being made here

That is not necessarily true. Alcohol and tobacco are legal and there are massive restrictions on how they are aloud to be advertised. The point being made here is that not many people would by more of it if they felt that purchasing it was not going to put them in legal trouble. For example, how many people do you know that do whippets?