Eggplant The food that is richest in nicotine concentration is eggplant. Eggplant contains a nicotine concentration of 100 ng/g. This vegetable is also a very good dietary source of fiber, vitamin B1, vitamin B6 and potassium. According to "The Encyclopedia of Healing Foods" by Michael T. Murray, the health benefits of eggplant consumption are directly linked to the presence of a strong antioxidant called nasunin 35. Nasunin protects the body against free radical damage, helps rid the body of excess iron and helps lower cholesterol levels.