Texas Health and Safety Code - HEALTH & SAFETY § 161.089. Preemption of Local Law

(a) Except as provided by Subsection (b), this subchapter does not preempt a local regulation of the sale, distribution, or use of cigarettes or tobacco products or affect the authority of a political subdivision to adopt or enforce an ordinance or requirement relating to the sale, distribution, or use of cigarettes or tobacco products if the regulation, ordinance, or requirement:

(b) A political subdivision may not adopt or enforce an ordinance or requirement relating to the lawful age to sell, distribute, or use cigarettes, e-cigarettes, or tobacco products that is more stringent than a requirement prescribed by this subchapter.