13. Parasitic infections A study unearthed last year involving an anthropologist named Dr. Edward Hagen from Washington State University in Vancouver looked at 379 Aka pygmies in Africa's Congo Basin, 95% of whom had worm-based parasitic infections, and many of whom smoked marijuana regularly. Dr. H
"I was a little surprised I was kind of looking for the flaws in the study but I think they did a pretty good job of convincing me they have a reasonable hypothesis," said Edward Hagen, a biological anthropologist at Washington State University Vancouver who was not involved in the study. "Have