Argument: That marijuana is herbal does not mean it is safe
- Susan Urbanek Linville. "The Case Against Legalizing Marijuana". Herald-Times. May 15, 2002 - "Is marijuana safe? Some argue that marijuana is a natural herb with a history of medicinal use, but historic use does not equate safety. Foxglove is a natural herb with a 1,000 year history, once used to treat epilepsy, water retention and cardiac symptoms. But foxglove contains digitoxin, a glycoside that can cause death."