http://science.howstuffworks.com/marijuana5.htm
http://www.420magazine.com/forums/cannabis-facts-information...
also watch http://www.imdb.com/title/tt1039647/
> Smoking cannabis is a double whammy, because tobacco
What? You can smoke cannabis without tobacco.
calm down, it's a common suggestion that THC levels are rising and rather than just repeating it I asked if it is, in fact true. A simple "no" is better.
Your first link does not support your point as strongly as you seem to think. Your second link is obviously a joke - no one would present such an obviously biased source with so many cherry picked reports seriously.