I did not, and am not, saying that it's harmless. That would be ridiculous. But if it's less harmful than alcohol, a substance which is legal for consumption a

I did not, and am not, saying that it's harmless. That would be ridiculous. But if it's less harmful than alcohol, a substance which is legal for consumption and moderated by the government, why should it be illegal? What's your justification for saying marijuana should be banned for reasons of harm, when you can't establish that it's more harmful than more easily available alternatives? Or are you also arguing that alcohol should be banned, as well? Edit: To answer your initial question, the logic here is "One harmful substance is legal, thus other substances which are less harmful should probably also be legal".