They started getting more picky about this in California. Definitely pulling people over in some areas when they see smoke billowing out the window.
Gov. signed a law making it illegal to smoke in a motor vehicle. I suppose you might be safe still if the car is parked on private property and is not running. Careful on the streets though.
RE: Ganjagirls - "If you don't have a car bong you're doing something wrong." - Albert Einstein