There is no place in the U.S. more expensive to smoke than New York City, where the taxes alone will set you back $5.85 per pack. Yet, addicts who visit Island Smokes, a "roll-your-own" cigarette shop in Chinatown, can walk out with an entire 10-pack carton for under $40, thanks to a yawning tax loophole that officials in several states are now trying to close.