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Nevertheless, mesothelioma may be related to brief, low level, or indirect exposures to asbestos. [28] The dose necessary for effect appears to be lower for asbestos-induced mesothelioma than for pulmonary asbestosis or lung cancer. [28] Again, there is no known safe level of exposure to asbestos as it relates to increased risk of mesothelioma.
However, cannabis smoke has been found to be carcinogenic in rodents and mutagenic in the Ames test. Correlating cannabis use with the development of human cancers has been problematic due to difficulties in quantifying cannabis use, unmeasured confounders, and cannabinoids' potential as cancer treatment. [76]
Due to the way marijuana is smoked — unfiltered and breathed in deeply and held in the lungs and throat for a few seconds — the risk from cannabis smoke could be even greater, experts say.
Many populated areas are in proximity to shallow, natural deposits which occur in 50 of 58 California counties and in 19 other US states. In one study, data was collected from 3,000 mesothelioma patients in California and 890 men with prostate cancer, a malignancy not known to be related to asbestos. The study found a correlation between the ...
Cannabis smoke was listed as a cancer agent in California in 2009. [31] A study by the British Lung Foundation published in 2012 identifies cannabis smoke as a carcinogen and also finds awareness of the danger is low compared with the high awareness of the dangers of smoking tobacco particularly among younger users. Other observations include ...
A survey of American adults found that many erroneously believe it is safer for the lungs to smoke weed than tobacco, and that any secondhand smoke from marijuana is also safer.
Quitting smoking was found to be the most beneficial prevention strategy overall, credited for averting 3.45 million lung cancer deaths. The study also looked at mortality and did not include ...
A 2016 review in The New England Journal of Medicine said that although there was a lot of hype and anecdotes surrounding medical cannabis and epilepsy, "current data from studies in humans are extremely limited, and no conclusions can be drawn". [32] The mechanisms by which cannabis may be effective in the treatment of epilepsy remain unclear ...