Riding in cars with smokers

It's Labor Day weekend and you have packed the family into the car for the two-hour drive to grandma's house. Because of the heat, you crank the AC and keep the windows closed. The problem is you are a smoker and after just two cigarettes you will have exposed your spouse and kids to particulates at a level well above government safety standards. That's the bottom-line finding of measurements recently published by engineering researchers at Stanford University.