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Through selective breeding of the Papaver somniferum plant, the content of the phenanthrene alkaloids morphine, codeine, and to a lesser extent thebaine has been greatly increased

The study, published in Nicotine & Tobacco Research , suggests that recent claims by some scientists that e-cigarettes are likely to act as a gateway to the use of tobacco products are overstated, says the studys lead author, population scientist David Levy, PhD, a professor of oncology at Georgetown Lombardi Comprehensive Cancer Center

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I've been chewing on them for years