The following is a troublesome statement to me about pot that I didn't know until now:

"Smoking marijuana is more dangerous than smoking cigarettes, experts say. The tar in joints contains a much higher concentration of the chemicals linked to lung cancer compared with tobacco tar. And smoking marijuana deposits four times more tar in the lungs than smoking an equivalent amount of tobacco, according to the National Institute on Drug Abuse."

http://www.cnn.com/2014/01/20/health/marijuana-versus-alcoho...