Ohio voters will decide next week whether to legalize recreational and medical marijuana. But they won't be able to change the laws that keep it a federally illegal substance and make the marijuana industry costly, burdensome, and risky. Four states and the District of Columbia have legalized recreational marijuana use and 23 states have medical […]

LOS ANGELES (Reuters) - Six people associated with a chain of medical marijuana shops in southern California were arrested on Thursday as federal authorities continued efforts to rein in commercial trade in the drug.

Story by: Elizabeth Landau - CNN.com Health Writer/Producer We hear a lot about the hazards of drunk driving, but here's something else to put on your radar: A study in the British Medical Journal found that marijuana nearly doubles the risk of vehicle collisions.