Strychnine and cyanide do not have any beneficial drug applications I am aware of. Nicotine does have beneficial drug applications, so it can correctly be classed (and is by my sourced link) as a drug.
Why is your classification of it so narrow?
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I said about 5 times that nicotine is a drug. It is quite blatantly obvious that it is a drug, or nobody on this forum would take it, because there would be no point taking it otherwise. Nicotine is a pesticide made by a plant to POISON insects, it also has pleasurable psychoactive effects in humans, so obviously it is a drug. But it is also a poison, it is a poison made by a plant as a pesticide which acts as a drug in low doses and a poison in high doses (for humans).
			
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