Weed
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Yes (to a certain extent) and No. Cigars are only for inhaling into the mouth (trust me I've sucked them into my lungs, its horrible). Cigar smokers suffer from mouth cancer, cigarette smokers suffer from lung cancers. You're asking specifically about weed, the answer I can give you is that inhaling anything which is on fire is bad for you, even hot drinks can increase your cancer risk, I would be interested to see the first answer reference the studies he referred to. If you must use cannabis your best bet would probably be to eat it. In summary inhaling smoke is bad for you whether you hold it in your mouth or your lungs, your mouth is not much of an exchange surface so you can't expect as greater effects but you might well get stoned (if you try hard enough).
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No, and no. For one, its absorbed in your lungs, not your mouth. So you will waste alot of it. For two, there are oral cancers, like toung, mouth, etc. Lol, weed has never given anybody cancer though, there have been study's, people who only smoke weed ( not cigarettes ) never got cancer, so dont worry about it.
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Smoking does nothing, trust me, there's no point. It won't do anything but burn a hold in your pocket and get you hooked and make you dependant on weed...
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It has to get to your lungs if you expect to feel anything.