is tobacco a gateway drug Why Nicotine What Does Gateway Drug Mean?
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Given this reality, the importance of self-government should be clear

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Halpern-Felsher, B., Kim, H

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Cotinine Testing Measures levels of cotinine, a metabolite of nicotine, which remains detectable for a longer period (up to a few days)
Depression: Chronic tobacco use alters brain chemistry, increasing depression risk and diminishing pleasure experience