California Code, Government Code - GOV § 7597

(a) No public employee or member of the public shall smoke a tobacco product inside a public building, or in an outdoor area within 20 feet of a main exit, entrance, or operable window of a public building, or in a passenger vehicle, as defined by Section 465 of the Vehicle Code, owned by the state.

(b) This section shall not preempt the authority of any county, city, city and county, California Community College campus, campus of the California State University, or campus of the University of California to adopt and enforce additional smoking and tobacco control ordinances, regulations, or policies that are more restrictive than the applicable standards required by this chapter.

(c) For purposes of this section, “smoke” and “smoking” have the same meaning as in subdivision (c) of Section 22950.5 of the Business and Professions Code.

(d) For purposes of this section, “tobacco product” means a product or device as defined in subdivision (d) of Section 22950.5 of the Business and Professions Code.