Personally I am not a Marijuana user. However I do believe that States Rights under many Circumstances do supersede federal law, Federal laws are Created by the Congress that is in many cases not a majority, When States have a majority of voters that accept a state law this must be respected by the federal Government and then concessions made under fairness to that group from that state or states, Fairness is also directly related to self determination of  the people. Any Government that tries to interferes with that social self determination' in most non military social cases, then becomes an authoritarian dictatorship, and violates the US Constitution. As People under the Bill of Rights Have the right to the pursuit  of happiness for Federal Government to dictate is wrong. The Federal Government is in power to defend the Nation and help protect its people not to involve its self in social issues regarding ones own body. Sorry to say in this case I believe that Jeff Sessions is wrong.