Kinda surprised to learn that 9.07kg (20lbs) of Eggplant contains as much nicotine as a cigarette. The discovery was published in a paper “The Nicotine Content of Common Vegetables” by three doctors at the University of Michigan.The researchers also found both through their own work and previous studies that nicotine is present in many foods we often consume like potatoes, tomatoes and eggplant — all plants in the family Solanaceaeuch.
According to a previous study detailed in the 1993 project, 10 grams of eggplant contains 1 µg (microgram) of nicotine — roughly the same amount one gets from three hours of exposure to second hand smoke. Cigarettes usually contain 1 mg (milligram) of nicotine, which means that a person would have to eat 10 kilograms, or 22.05 pounds, to reach that amount.
The Huffpo Health made a very nice slideshow of other vegetables that contain measurable amount of nicotine.