C.R.S. § 18-18-406.4

(1) A person who is not licensed to sell medical marijuana or retail marijuana pursuant to article 10 of title 44 , or pursuant to the laws regarding medical or retail marijuana under the laws of another state, who knowingly advertises in a newspaper, magazine, handbill, or other publication or on the internet the unlawful sale of marijuana, marijuana concentrate, or a marijuana product by a person not licensed to sell marijuana, marijuana concentrate, or a marijuana product commits a level 2 drug misdemeanor. (2) The provisions of subsection (1) of this section do not apply to a primary caregiver, as defined in section 14 (1)(f) of article XVIII of the state constitution, who advertises that the primary caregiver is available to be a primary caregiver to a patient, as defined in section 14 (1)(d) of article XVIII of the state constitution.