Why would you need eggplant patches or gum??
Eggplant contains nicotinic acid, which has a similar molecular structure to nicotine, but is not the same thing as nicotine, and does not have nicotine's addictive or stimulating properties. The nicotinic acid in eggplant makes it an excellent source of niacin, an essential vitamin for blood and brain function.
No, not so.
Nicotinic acid, or vitamin B3, could be found in a lot of foods, including beer (i like vitamins).
Nicotine is a different animal. Eggplant does have a lot of nicotine, but much, much less than tobacco have.