California Code, Health and Safety Code - HSC § 1596.795

(a) The smoking of a tobacco product in a private residence that is licensed as a family day care home shall be prohibited in the home and in those areas of the family day care home where children are present. Nothing in this section shall prohibit a city or county from enacting or enforcing an ordinance relating to smoking in a family day care home if the ordinance is more stringent than this section.

(b) The smoking of a tobacco product on the premises of a licensed day care center shall be prohibited.

(c) For purposes of this section, “smoking” has 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.