[P_A_I]

People growing their own marijuana for their own personal use in no way affects interstate commerce.

True. - Same principle applies to making your own booze, -- or guns.

The STATES have the authority of prohibiting it if the people so desire.

Never give an inch.
States have no delegated power to prohibit making & using most anything. -- They can only 'reasonably regulate' most activities, restricted by Constitutional due process.

[robertpaulsen]

"States have no delegated power to prohibit making & using most anything."

Delegated?

States had all the power -- back in 1789 they delegated some of that power to the newly created federal government. Whatever wasn't delegated, they retained.

One of those retained powers was the police power, and the states are allowed to prohibit making and using anything they damn well please, provided it isn't against the state constitution.

THAT is how the U.S. Constitution was written and ratified.