The Utah Senate has approved legislation that would make it illegal for drivers to smoke in the car if they have a passenger younger than 16.
Lawmakers approved the measure on a 16-13 vote Friday.
The violation would be a secondary offense. That means an officer couldn't pull someone over for smoking with a child passenger but could enforce the law while stopping a driver for another violation.
Violators would get a warning on the first offense and be fined $45 on the second.
Supporters say child safety trumps adults' personal freedoms, and secondhand smoke in confined spaces such as a car is an "unacceptable" health threat to children.
Critics say the bill infringes on the personal freedoms of adults and sets a precedent for government interference.