So is caffeine a drug? Because nicotine and caffeine are strikingly similar. They are both naturally occurring substances that have an effect on the body. If nicotine is a drug, then caffeine is too. Walnuts are drugs, oats are drugs, onions are drugs ... shall I go on?
Yes, all drugs. Some drugs are also food, and are primarily that. What other purposes do humans have for nicotine, that are primary?