No one ever died from using marijuana. That's the bottom line. If it is that safe, why is it illegal? That is the big question. Many substances that actually are very dangerous are legal. What is the criteria to make a substance legal and other substances illegal? Their potential lethality? What?
Why should such a benign substance be illegal? Inquiring minds want to know. Just because the government says so is not a good enough reason for many people, including me.
Because it's immoral? Gasp!
Understand the concept? Lots of activities are safe, but illegal -- drugs, pornography, gambling, prostitution, etc.
Granted, the possible effects of these activities may not be conducive to a safe, healthy and functioning society, in fact they may be downright deadly, but you don't want to discuss those effects, do you?
Oh well. My dad once said that if you have to explain morality to someone you've already lost the argument. So I'll just leave it at that.