Cannabis smoke is not as carcinogenic as tobacco smoke. In a review article published today in Harm Reduction Journal, Dr. Melamede from the University of Colorado, Colorado Springs, USA, writes that although cannabis smoke and tobacco smoke are chemically very similar, evidence suggests that their effects are very different and that cannabis smoke is less carcinogenic than tobacco smoke.
Cannabis has also been shown to kill cancer cells and to reduce tumour growth, in part by reducing the formation of blood vessels that feed tumours. But "the effects of cannabinoids are complex and sometimes contradicting", warns the author. In addition, as cannabis is frequently smoked with tobacco, the effects of the two drugs may interact in complex ways.
[via ScienceDaily Headlines]