"Nicotine is an alkaloid found in the nightshade family of plants (Solanaceae), predominantly in tobacco and coca, and in lower quantities in tomato, potato, eggplant (aubergine), and green pepper. Nicotine has been found to constitute approximately 0.6-3% of dry weight of tobacco,[1] with biosynthesis taking place in the roots, and accumulating in the leaves. It functions as an antiherbivore chemical, being a potent neurotoxin with particular specificity to insects; therefore nicotine was widely used as an insecticide in the past, and currently nicotine derivatives such as imidacloprid continue to be widely used". Read more about Nicotine

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