It's futile to even debate you on the subject if you won't debate the comparison. It's the comparison that gives you a basis for the debate to begin with.

It's akin to wanting to outlaw amusement parks. They are dangerous, and serve no purpose other than entertainment. Could I not compare the dangers of amusement parks to say, water parks, if one was illegal and the other was not, especially when they both are things you choose to do?

All in all it should be your own personal choice with what you do to your body, or EVERYTHING that can change our state of mind should be illegal, not just those things the government decides should be illegal.