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Description
Daily nicotine intake scales with how many cigarettes you smoke

At first, it affects your nose, sinuses, and throat

Oral microorganisms accumulate to form biofilm on the tooth surface and subgingival sulcus, and smokers have been shown to demonstrate diverse microbial colonisation of biofilms than non-smokers, thus suggesting the role of smoking in promoting bacterial acquisition and colonisation in the biofilm [18]

Whether or not weed is a gateway drug is controversial

But it also saves lives
Reports from drug abusers have also revealed that drug use was maintained not only by the rewarding properties but also their desire to alleviate craving or withdrawal symptoms [162]