When did Vermont legalize medical cannabis? Vermont is one of the 23 US states that have legalized medical cannabis. It passed Senate Bill 76, receiving majority support from the House, and signed into law the "Act Relating to Marijuana Use by Persons with Severe Illness" on May 26, 2004. It was made effective starting May 30, 2007.    Who can use medical cannabis in Vermont? Only qualified patients and caregivers can use, possess, and purchase medical cannabis in ...