Earlier quoted context omitted.
States can be more restrictive but they cannot be less restrictive. Thus if the nation declares that marijuana is illegal a state cannot declare that it is legal (see the medical marijuana raids in California). And if the nation declares that alcohol is legal then a state can make it illegal within that state.
And this is the opposite of what the founders would have wanted, I'd guess. The constitution mandates that powers not specifically granted to the federal government are reserved by the states. I'm no constitutional scholar, but I'm pretty sure the federal authority to regulate drugs was "found" in the interstate commerce clause as part of the food and drug reforms in the early 1900s. At the time, there were definitel…
In any case, the 1937 bill created an impossible-to-satisfy tax structure, because they knew that a direct prohibition would have been deemed unconstitutional. Unfortunately, by 1970, everyone had forgotten and the Controlled Substances Act passed easily.