03-13-2007, 09:14 PM
Actually Tea has a closely related substance called theophiline. It has been used for asthma because it opens up your airways. Chocolate contains theobromine, which is also somewhat different than caffeine. Both seem to have more cardiopulmonary effects than caffeine (chocolate sometimes makes people's "heart pound", etc.). I don't know why people continue to call these substances caffeine though, cuz they're not. kj.