Links
[1] http://www.dailymail.co.uk/health/article-2782906/The-terrible-truth-cannabis-British-expert-s-devastating-20-year-study-finally-demolishes-claims-smoking-pot-harmless.html
[2] http://www.rethinkpot.org/tags/brain
[3] http://www.rethinkpot.org/tags/study