I'd like to know, how do you feel about the legality of cigarettes and alcohol. Presumably, you don't want your kids smoking cigarettes. Would you like them to be illegal to sell?
I'm also not really sure your thoughts on availability really hold in the way you are thinking. Take for instance glue and paint. These are both widely available for getting high currently, but are rarely used to do so because people understand the negative tradeoff associated. Under your view though, it would seem you prefer these be made illegal to prevent availability?