Perhaps the skeptics.nay-sayers would do well to listen to what the EXPERTS say about cannabis and how long it has been around:  http://blog.world-mysteries.com/science/the-marijuana-conspiracy/ 
And no, I gave up smoking (tobacco) fourteen years ago and have never looked back since.  However, how many people die as a result of tobacco causing lung cancer - my husband was a victim who passed on in 2010 - LUNG CANCER CAUSED BY TOBACCO!!!  And government banned any tobacco advertising, but let me ask how many road deaths, broken homes, murders, etc occur almost on a daily basis here because of drunkenness - yet Government refuses to ban alcohol ads - it's all very well and good telling people to "drink responsibly" but who really cares, especially at parties, yet the ads are run ad-infinitum and even young kids in primary schools are now drinking alcohol and taking drugs, but - DRINK RESPONSIBLY??? But dagga leads to drug abuse?  Rather get rid of the Nigerian druglords.  Get a life!!!