Not sure if this will help, givin the quality and all but here is a comparison of a few of the most popular drugs, it was in an article a few years back in The Nation magazine, I believe.

http://i43.photobucket.com/albums/e400/J0shhh/DrugChart.jpg

It's interesting how it shows that Caffine is worse for you than Marijuana.

I apaologize for the low quality of this document. You can thank Kinkos for the shoddy work. Hope it helps.