Several longitudinal studies have established that even long-term marijuana smoking is not associated with elevated cancer risk, including tobacco-related cancers or with colorectal, lung, melanoma, prostate, breast or cervix. A 2009 population-based case-control study found that moderate marijuana smoking over a 20-year period was associated with reduced risk of head and neck cancer. And a five-year-long population-based case-control study found even long-term heavy marijuana smoking was not associated with lung cancer or upper aerodigestive tract cancers.[5] In fact, some of the chemicals in marijuana, such as THC and especially CBD, have been found to induce tumor cell death and show potential as effective tools in treating cancer. Scientists who have conducted this type of research, such as UCLA’s Donald Tashkin, hypothesize that the anti-oxidant properties of cannabis might override any cancer causing chemicals found in marijuana smoke, therefore protecting the body against the impact of smoking. Newer research indicates that marijuana has anti-cancer properties and could one day unlock new cancer treatments.
Moreover, marijuana smoking is not associated with any other permanent lung harms, such as chronic obstructive pulmonary disorder (COPD), emphysema or reduced lung function – even after years of frequent use.
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