At at the federal level, there is the possible risk of prosecution for marijuana advertising under the Controlled Substances Act. 21 U.S.C. section 843(c) bans placement of written advertisements for marijuana and other controlled substances in any newspaper, magazine, handbill or other publication knowing it is done with the purpose of seeking or offering unlawfully to receive, purchase or distribute marijuana.
Does that mean you can’t advertise? Not exactly. The measure is seldom-enforced, but it does mean that you’ll need to proceed with caution.