Like alcohol, marijuana impairs driving performance. The question is how much. Advocacy groups claim that marijuana affects psychomotor skills only mildly and that this doesn’t seem to play a significant role in road accidents compared to alcohol.
You probably know that you shouldn't fly if you have a contagious illness, but there are other situations—from a broken bone to a recent scuba dive—that may also merit delaying or even canceling a trip. Here's what you need to know to stay safe in the air.