First, although cannabis is legal to possess as of July 1, 2021, medical cannabis dispensaries are the only locations available to buy cannabis until 2024.
Second, by purchasing cannabis with your medical cannabis card you will not have to pay the 21% retail sales tax.
Third, by having a medical cannabis certification you are granted certain rights and protections under the law. “No employer shall discharge, discipline, or discriminate against an employee for such employee’s lawful use of cannabis oil pursuant to a valid written certification issued by a practitioner for the treatment or to eliminate the symptoms of the employee’s diagnosed condition or disease pursuant to § 54.1-3408.3.” See Virginia law.