Incomplete combustion of any organic substance will produce polycyclic aromatic hydrocarbons - many of which are toxic and carcinogens. It doesn't matter if it is tobacco, marijuana, incense or cedar. Burining your food while cooking will also produce some of the same chemicals (I believe burnt meat will produce benzo-pyrene which can cause cancer).
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"A pessimist thinks things can't get any worse. An optimist knows they can."
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