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So you're a cigarette smoker and want to lower your chance of getting cancer?
Just use a mix of 25% herb and 75% tobacco:
Just use a mix of 25% herb and 75% tobacco:
Science: Why cannabis smokers may have a lower cancer risk
than tobacco smokers
Eleven scientists from the USA and Taiwan summarized data
from basic research and a re-evaluation of an epidemiological
study by Sidney and colleagues from 1997. Their investigation
indicates that cannabis smoke may not increase or even decrease
the incidence of cancers associated with tobacco smoke. While
cannabis smoke contains higher levels of carcinogenic polycyclic
aromatic hydrocarbons (PAH) than in tobacco smoke, this may
not mean that cannabis smokers are at a higher cancer risk than
tobacco smokers, since the level of PAHs is less important than
the influence of substances on PAH activation by certain
enzymes in the liver. "Not surprisingly, spiking tobacco tar with
delta-9-THC markedly reduced carcinogenic activity" in
experiments with cancer cells, scientists wrote in an article for the
Journal of Psychoactive Drugs.
It is known that cannabis smoking causes precursors of cancer,
which are also observed in tobacco smokers. However, studies
show that these precursors "may have little, if any predictive
value" and these lesions are "generally reversible and often
regress spontaneously." In studies with monkeys "prolonged
exposure to marijuana smoke failed to produce any carcinogenic
effects."
In the cohort study by Sidney et al. (1997) with about 65,000
subjects tobacco smokers had a significantly higher risk to develop
lung cancer than cannabis smokers after a mean observation
period of 8.6 years. In addition, cannabis smokers had a
significantly lower lung cancer risk than subjects, who did not
smoke cannabis. In reply to the argument, Sidney and colleagues
did not follow the participants of their study long enough to find an
increased incidence of cancers in the cannabis group, they noted
that "surprising enough, the follow-up period was sufficient to
observe 179 cases of TRC [tobacco related cancers] (including
lung) among TS [tobacco smokers]." If the cancer risk of tobacco
smokers equals that of non-smokers, then 130 cases would be
expected among tobacco smokers. In contrast, only three cases of
tobacco related cancers were observed in cannabis smokers. If
the incidence of tobacco related cancers in cannabis smokers
equals that of non-smokers, "then 16 cases would be expected in
MS [marijuana smokers]."
(Source: Chen AL, Chen TJ, Braverman ER, Acuri V, Kemer M,
Varshavskiy M, Braverman D, Downs WB, Blum SH, Cassel K,
Blum K. Hypothesizing that marijuana smokers are at a
significantly lower risk of carcinogenicity relative to tobacco-non-
marijuana smokers: evidenced based on statistical reevaluation of
current literature. J Psychoactive Drugs 2008;40(3):263-72.)
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