23 U.S. states that have legalized medical cannabis 23 U.S. states that have legalized medical cannabis the moment, there are 23 U.S. states that have legalized medical cannabis for medicinal use. One of them is the state of Delaware. If you are a resident of that particular state and you need medical cannabis for treatment, here are some information that might help you:  Medical cannabis bill in Delaware  1. The medical cannabis bill in Delaware was signed into law on May 13, ...