The same argument that goes for the the right to free speech and the right to bear arms goes for medical cannabis. Individual liberties must be preserved, and the government has no business telling people what they can or cannot do with their own bodies.
This shirt was put together to raise funds to help support veterans in Montana who need assistance with getting their medical cannabis cards. The clinics charge $150 on average to write their recommendation and the state has raised the application fee to $30. Many disabled veterans are unable to fit these annual costs into their budgets.