Nornicotine is an alkaloid found in various plants including Nicotiana, the tobacco plant. It is chemically similar to nicotine, but does not contain a methyl group. It is a precursor to the carcinogen N-nitrosonornicotine that is produced during the curing and processing of tobacco. ...
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http://en.wikipedia.org/wiki/Nornicotine
an alkaloid, CHN, extracted from tobacco and related to nicotine but having a lower toxicity: used as an agricultural and horticultural insecticide.
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https://www.infoplease.com/dictionary/nornicotine
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