The word "drug" has no successful definition. If you say "a substance that alters how your brain works", then even water is a drug. Sugar and coffee are almost

The word "drug" has no successful definition. If you say "a substance that alters how your brain works", then even water is a drug. Sugar and coffee are almost surely drugs under any non-laundry-list definition you can come up with. Cacao is most certainly a drug ;)