California Code, Business and Professions Code - BPC § 22964

This division sets forth minimum state restrictions with respect to the legal age to purchase or possess tobacco products and does not preempt or otherwise prohibit the adoption of a local standard that imposes a more restrictive legal age to purchase or possess tobacco products.  A local standard that imposes a more restrictive legal age to purchase or possess tobacco products shall control in the event of any inconsistency between this division and a local standard.