Cigarettes don't really cause cavities if you have healthy teeth, but they can certainly speed up the process of getting one because the nicotine is absorbed in your mouth through the smoke while you are inhaling, whether or not you "direct inhale". Proof: The yellow and brown nicotine stains that are dominant in people who have smoked for a long time, and personal experience.
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No. What causes cavities is bacteria, and marijuana doesn't kill bacteria. If anything, you may be munching on stuff that's going to lead to cavities, or just forgetting to brush your teeth.
Yes. marijuana has a fantastic amount of tar in it and like cigarettes will stain teeth.
Yes, Chewing tobacco increases the amount of saliva in the mouth which is acidic and wears down the enamel on your teeth. Smoking has the the same effect
Smoking weed is known to be bad for one's teeth. Smoking an abundance of marijuana over an extended period can cause yellowing of the teeth and even worse, tooth decay.