'With the addition of Pennsylvania and Ohio in 2016, the total number of states in America allowing the use of cannabis medically is now 25. The non-state known as the District of Columbia or Washington, D.C., the nation’s capitol, also has allowances for medical cannabis.
They all have variations of what ailments or diseases are allowed for obtaining a medical marijuana permit. The states that are the most liberal include Colorado, Washington (state), and Oregon. They allow recreational use of marijuana, thus eliminating the need for approval from a bureaucratic medical marijuana approval system.'