Cannabis law differentiates from state to state and you will definitely need to look up your laws if you plan on smoking any sort of cannabis, medical or not, so you know if you’re within the law or breaking it.
Of course you would likely need a medical marijuana card, and to get one of those you can find a doctor in your state that sees patients and gives you a recommendation for a medical marijuana card.
If they deem you fit for medical marijuana, they will issue you a card that will be mailed to you and once you receive it, you can then purchase medical marijuana legally under the cannabis law.
Another option many people have considered recently is to use hemp-derived products like a full-spectrum hemp-derived CBD vape cartridge, which has little or no THC meaning there is no psychoactive component. Although these hemp derived products do not get users “high” they do contain many of the other beneficial cannabinoids found in both hemp and cannabis plants; Especially cannabidiol or CBD which has been proven in numerous independent studies to have many beneficial medicinal effects for its users.