OK, Maybe Not All Smoking is Bad

The chemical in cannabis that produces a high may help to combat the
spread of cancer, research suggests.

Scientists have discovered the active ingredient, delta-9-tetrahydrocannibol
can block the spread of gamma herpes viruses.

The viruses are linked to an increased risk of the cancers Kaposis sarcoma, Burkitts
lymphoma and Hodgkins disease.

The research, by the University of South Florida, is published in the online
journal BMC Medicine.

from the BBC