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He explained that the results won't be as dramatic because toothpaste doesn't soak into the enamel to bleach the way strips or chemical treatments do

1997 Jul-Aug;26(4):451-6

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The study had the following to say: Lack of evidence for marijuana SHS causing acute cardiovascular harm is frequently mistaken for evidence that it is harmless, despite chemical and physical similarity between marijuana and tobacco smoke. In Conclusion In short, we would agree with Wolff et als assessment in their research review, stating, In light of this review, cannabis has to be considered as harmful and the cerebrovascular risk when cannabis is consumed is probably underestimated. Though almost all sources point out that more research is needed, it is undeniable that the physical effects of marijuana / pot on the heart, lungs, and brain are real