Mary Jane Trumps Joe Camel By Mary BeckmanScienceNOW Daily News23 May 2006 It seems logical that inhaling enough smoke will give you lung cancer. But a new study of Los Angeles residents suggests that smoking marijuana--even more than 22,000 joints in a lifetime--doesn't increase cancer risk. The results surprise many researchers, who point out marijuana has other ill health effects. Decades of research have shown that cigarette smoking dramatically increases the risk of certain cancers. But controversy surrounds the risk of smoking weed. A 1999 study of blood donors suggested a link between marijuana and head and neck cancer,...