Do you believe in Cannabis prohibition?

Prohibiting Cannabis has only helped create an underground of crimelords and dirty money. In short, it has helped to fuel mafias and crime. If you study the history behind Cannabis prohibition you'd learn some pretty amazing things. I don't understand how smoking which is more dangerous than marijuana can be legal. Marijuana is an herb from the ground. How can one defend cigarettes but condemn marijuana? I thought we had learn from alcohol prohibition but it seems many like to repeat history.