The terrible truth about Cannabis: Expert's devastating 20-year study finally demolishes claims that smoking pot is harmless

Story by Daily Mail
Written by Ben Spencer

* One in six teenagers who regularly smoke the drug become dependent
* It doubles risk of developing psychotic disorders, including schizophrenia
* Heavy use in adolescence appears to impair intellectual development
* Driving after smoking cannabis doubles risk of having a car crash
* Study's author said: 'If cannabis is not addictive then neither is heroin'
* The drug is currently legal in two states - Washington and Colorado
* A further 21 states have allowed it to be used for medicinal purposes

President Barack Obama - admitted former smoker - said earlier this year Cannabis is not as dangerous as alcohol.

Read more: http://www.dailymail.co.uk/news/article-2783111/The-terrible-truth-cannabis-Expert-s-devastating-20-year-study-finally-demolishes-claims-smoking-pot-harmless.html#ixzz4JWdENbGx