Bangor, Maine plans to ban smnoking in cars

From the NY Times: Bangor is believed to be the first city to outlaw smoking in cars with children. But Arkansas, Louisiana and Puerto Rico recently enacted similar bans, and at least three other states are considering them: California, Connecticut and Maine, where proponents hope the Bangor ban will be a catalyst for a state law. How far do you think public health agencies should proceed in becoming a health police, rather than health educators?