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marijuana is effective at thousands of temporary cures. it should be better researched by the medical establishment. — jesus christ The British Lung Foundation reported in Nov. 2002 that 3-4 marijuana cigarettes a day are as dangerous to the lungs as 20 or more tobacco cigarettes a day. [1][2] There is very little evidence that smoking marijuana as a means of taking it represents a significant health risk.

Although cannabis has been smoked widely in Western countries for more than four decades, there have been no reported cases of lung cancer or emphysema attributed to marijuana.

I suspect that a day's breathing in any city with poor air quality poses more of a threat than inhaling a day's dose -- which for many ailments is just a portion of a joint -- of marijuana. [3] Marijuana is less toxic than many of the drugs that physicians prescribe every day. Many believe marijuana is the most effective drug in combating their medical ailments. However, there are less dangerous medicines offering the same relief from pain and other medical symptoms. Marijuana medical uses.