Dave, I can't help but notice that your sources seem a bit biased? And just glancing through, I see that they even support what Nicholas is saying: "The study concluded that alcohol was the most harmful drug overall (72 out of 100), followed by heroin (55 out of 100), and crack cocaine (54 out of 100). The most harmful drugs to users were crack cocaine, heroin, and methamphetamine (scores 37, 34, and 32, respectively), whereas alcohol, heroin, and crack cocaine were the most harmful to others (46, 21, and 17, respectively). Cannabis (aka marijuana) had an overall harm score of 20, putting it in eighth place behind amphetamine (aka speed) and before GHB (aka liquid ecstasy)." The point being...marijuana may not be as harmful as other drugs, but that doesn't mean it's harmless!