Health and Safety Code Section 118948
118948. (a) It is unlawful for a person to smoke a pipe, cigar, or cigarette in a motor vehicle, whether in motion or at rest, in which there is a minor.
(b) For the purposes of this section, “to smoke” means to have in one’s immediate possession a lighted pipe, cigar, or cigarette containing tobacco or any other plant.
(c) A violation of this section is an infraction punishable by a fine not exceeding one hundred dollars ($100) for each violation.