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But risk of head and neck cancer was far higher if people also smoked cigarettes, incidating that the two work together to promote cancer development.
Users of both substances had 36 times the risk of head and neck cancer found in people who used neither.
Don't they realize how strong and unpleasant the smell is?
It's far worse than cigarette or even cigar smoke.
There is some comfort for dope smokers who presumed it relatively harmless.
One joint is more dangerous than one cigarette, but the effect of cigarettes on health is probably greater, said Eugenia Calle of the American Cancer Society, 'because people just smoke so many more cigarettes'.
Researchers in the field welcomed the study, saying it proved what they long suspected.Frequency of marijuana use was categorised as never, less than or equal to once a day, and more than once a day.Duration of use was categorised as never, one to five years and more than five years.Previous research has shown dope and cigarette smokers can develop pre-cancerous changes in throat-lining cells.But this study, carried out in New York, is the first definitely to link the smoking of joints to full cancers of the head and neck.
It suggests that the drug's popularity in recent decades could lead to swaths of the population with cancer.