Uh... i dont really make that big a deal out of it, cops around here dont really care about just smokin weed they are more about the dealers. that said dont blow weed smoke in a cops face but as long as you are minding your own business it is usually ok to sit in your car and smoke a pipe. they wont fuck with you. just make sure to have your windows up and the recirc/defrost on so its not smellin out there, cuz that can put up a red flag.