20. http://www.quit-smoking-central.com/effects-of-smoking-weed.html Information: Federal Marijuana Law 2010, Nov, 10th, http://www.safeaccessnow.org/article.php?id=2638 Pete Guither- Why is Marijuana Illegal http://www.drugwarrant.com/articles/why-is-marijuana-illegal/ Wikipedia- Jamestown settlement, cannbis, legal history of cannabis, uniform narcotic drug act