Topic is not addressed in state statutes or regulations, but is addressed in non-codified policy.
Texas Administrative Code 25 297.5 Building Operation and Maintenance Guidelines
(e) Tobacco Products. The use of any smoking tobacco products or smokeless tobacco products by employees or visitors should be prohibited in government buildings, within twenty feet of any entrance, and within twenty feet of the building's fresh air intakes. The use of such tobacco products should be permitted only in outside areas that have been designated for "Tobacco Product Use."
Texas Statutes Education Code 28.004. Local School Health Advisory Council and Health Education Instruction.
(k) A school district shall publish in the student handbook and post on the district’s Internet website, if the district has an Internet website: (3) a statement of: (C) whether the district has adopted and enforces policies and procedures that prescribe penalties for the use of e-cigarettes, as defined by Section 38.006, and tobacco products by students and others on school campuses or at school-sponsored or school-related activities.
Texas Statutes Education Code 38.006. E-Cigarettes and Tobacco Products on School Property.
(a) In this section, “e-cigarette” has the meaning assigned by Section 161.081, Health and Safety Code.
(b) The board of trustees of a school district shall:
(1) prohibit smoking or using e-cigarettes or tobacco products at a school-related or school-sanctioned activity on or off school property;
(2) prohibit students from possessing e-cigarettes or tobacco products at a school-related or school-sanctioned activity on or off school property; and
(3) ensure that school personnel enforce the policies on school property.