(BBC, Monday, 11 November, 2002, 22:23 GMT)
Dame Helena Shovelton, chief executive of the British Lung Foundation, said: "Puff and inhalation volume with cannabis is up to four times higher than with tobacco - in other words you inhale deeper and hold your breath with the smoke for longer before exhaling.
"This result in more poisonous carbon monoxide and tar entering into the lungs."
One commenter on the linked page noted you could convert cannabis -- with all its fabled sedative and hallucinogenic effects -- into a harmless, non-carcinogenic spray. The only problem is, this conversion process, if it were to be applied on a large scale for public consumption, would require taking the neo-con nightmare step of legalising cannabis. Conservative nightmare or not, I do think taking that step is only a matter of time. The drug war is not over, for it never got off the ground.