Cal. Health & Safety Code § 110420

(a) Any fragrance advertising insert contained in a newspaper, magazine, mailing, or other periodically printed material shall contain only microencapsulated oils. Glue tabs or binders shall be used to prevent premature activation of the fragrance advertising insert.
“Fragrance advertising insert” means a printed piece with encapsulated fragrance applied to it that is activated by opening a flap or removing an overlying ply of paper.
Paperstocks employed in the manufacture of fragrance advertising inserts shall have a maximum porosity of 20 Sheffield units or 172 Gurley-Hill units.
(b) Any person who distributes fragrance advertising inserts in violation of this section, is guilty of an infraction and shall, if convicted, be subject to a fine of one hundred dollars ($100) for each distribution. The fine shall apply to each mass mailing or distribution, and to each mass publication of a magazine or newspaper in violation of this section. The fine shall not apply, however, to each individual letter, magazine, newspaper, or fragrance advertising insert so distributed. Section 111825 is not applicable to violations of this section.
(c) This section shall become operative on January 1, 1992.