In some states, it is required to obtain a license in order to carry a concealed weapon. That says something different about that product.
Oxycontin is legal, but only available with a doctor's prescription. Again, an even different message.
Unfortunately, in today's society, legality carries with it a certain "approval". In other words, "If it's not illegal, then I can do it and don't you dare pass moral judgement on me". We need to keep that in mind in our legislation.
But, that wasn't the point of my post. The point was that it's foolish to think that the legalization of marijuana "solves" problems. It doesn't. Like alcohol, it would merely transfer those problems to other areas.