What's the largest, least regulated and most misunderstood drug trade in America? That would be caffeine. In his brand new book Caffeinated, investigative reporter Murray Carpenter takes a deep dive into this white-powder stimulant.
Huffington Post: 7 worrisome facts about caffeine
The study says the caffeine in coffee is more concentrated, so even a five-ounce cup of weak coffee has almost twice as much as a can of soda.
