Is it the chemical makeup of nicotine vs THC/CBD? Given the fact they are both smoked, and burnt plant matter are both inhaled in the lungs, it is said that burnt tobacco smoke is more carcinogenic than cannabis smoke. Also, cannabis is used medicinally and therapeutically whereas tobacco is not.
Edit: I am aware that cannabis is better used medicinally as a tincture or in a non-smoked method (i.e. edibles). That would be the safest method of consumption.
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Here’s a 2008 study on the epidemiology of cancer and marijuana use:
https://erj.ersjournals.com/content/31/2/280
Conclusions: smoking marijuana does indeed appear to increase risk of cancer. Apparently, on average, one joint is about equal to twenty cigarettes in terms of increasing risk. See “Discussion”, which describes the many problems inherent in studying the subject.
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