Here are a few. Still not clear.
http://wiki.answers.com/Q/Which_is_w...arettes_or_pot
http://www.cbsnews.com/8301-504763_1...or-your-lungs/
http://stopthedrugwar.org/speakeasy/...our_lungs_toba
http://www.huffingtonpost.com/2012/0...n_1197854.html
http://patients4medicalmarijuana.wor...vs-cigarettes/
http://www.drugfree.org/join-togethe...king-marijuana
http://news.bbc.co.uk/2/hi/health/2419713.stm


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