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When this barrier becomes less effective, potentially harmful substances from inside the gut may pass more easily into the gut wall

Learning Objectives Identify types of gateway drugs Understand how caffeine, tobacco, alcohol, marijuana work in the human body Explain the difference between use, misuse, abuse and dependence of gateway drugs Demonstrate familiarity with drug use policies and laws and the impacts they have on legal and illegal use related to the classes of gateway drugs Image 4.1 Image of Several Used Cigarette Butts Learning Content A drug is a chemical agent capable of producing biologic responses within the body

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It was during this time that pipe smoking was also gaining popularity

Antifungal oral candidiasis medications may be used to treat thrush