Drugs are substances derived mostly from plants. Some of the plants are edible plants, some are poisonous plants. They take only the active ingredient from the plant, making it unnatural, therefore side effects. It is not the way that nature made the herbs. They do this so they can patent it and make a profit, because you cannot patent a natural herb. Some drugs are legal, although many times deadly, the fun ones are mostly illegal. It is very interesting to check out a book at the library on the history of drugs.