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As far as cancer risks from smoking anything go, marijuana is about the best you're going to get as THC is a potent anti-carcinogen. As far as herbal blends go, I don't have any experience with them but I'm not sure there's much difference from tobacco. Nicotine itself is not much of a carcinogen if I recall, it's really the tars and other combustion byproducts in smoke that cause the problem. (If you just want to get a buzz, use a vaporizer, but if you want to blow smoke that doesn't help you.)
Really though, I think the cancer risk from smoking anything is minimal from occasional use. It's more when you get to a pack a day that you need to worry.
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"Prohibition will work great injury to the cause of temperance. It is a species of intemperance within itself, for it goes beyond the bounds of reason in that it attempts to control a man's appetite by legislation, and makes a crime out of things that are not crimes. A Prohibition law strikes a blow at the very principles upon which our government was founded." --Abraham Lincoln
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