Ginger can be tricky to peel with all its bumps and irregularities. Rather than using a paring knife or vegetable peeler, reach for the spoon. Scrape it against the skin and it'll come right off, following every contour and minimizing waste.
Vegetable Nicotine in ng/g g per 1µg nicotine
Cauliflower 16.8 59.5
Eggplant (Aubergine) 100.0 10
Potatoes 7.1 140
Green tomatoes 42.8 23.4
Ripe tomatoes 4.3 233.0
Pureed tomatoes 52.0 19.2
The data is taken from the New England Journal of Medicine vol 329 p437. 1µg of nicotine is the equivalent of sitting in a vaguely smoke filled room for three hours. A cigarette contains about 7mg of nicotine, of which 1mg is absorbed. In other words, 100g of eggplant contains 0.01mg of nicotine, and 10kg of eggplant is equivalent to one cigarette. However, absorbtion rates from ingestion are low and nicotine is quickly metabolized, so the effect isn't nearly the same.