"The tar from cigarette smoke is similar to that of marijuana smoke" http://en.wikipedia.org/wiki/Tar_(tobacco_residue) http://en.wikipedia.org/wiki/Tar_(tobac

"The tar from cigarette smoke is similar to that of marijuana smoke" http://en.wikipedia.org/wiki/Tar_(tobacco_residue) http://en.wikipedia.org/wiki/Tar_(tobacco_residue)