while i know that inhaling any smoke is bad, i would not point to those stories as evidence that cannabis is more carcinogenic by any means. these news stories which now state that smoking pot is bad/worse than cigarettes tend to cite these three studies which covered only 100 people altogether (79 people being the highest). that is a very small amount to test from. there was also no comparative group or control group in those studies to measure the results with (which makes the results somewhat biased). the results from the studies do make for good headlines!

conversely, the Web MD article of 2006 linked in the above post (and in this washington post article) references a study finding no link to smoking pot and lung cancer which used over 2,200 people; 1,200 people with lung cancer and 1,041 people without lung cancer. it was the largest case-control study ever done regarding marijuana use. its findings would be much more accurate.

it would be great to compare the data between these two differing studies.

in any case, if you are going to smoke marijuana, avoid smoke as much as possible and buy a vaporizer.

anyway - thanks for the comment tony!