Generally speaking, as long as no federal law is violated, particularly not the Constitution, state law can be more prohibitive than federal law, but not less prohibitive.
This is true. However, it is also true that laws are only as enforceable as the desire or will of people to enforce them. Many states (such as California) do not see the value of throwing money at this issue or clogging up our penitentiaries with people who shouldn't be there. If you look at how the government has classified marijuana it is obviously ridiculous. FFS, by their classification, marijuana is more dangerous than fentanyl and oxycodone?!?! I would much rather someone take a bongrip after a day at work than have them be strung out on fantanyl or oxycodone.https://www.dea.gov/druginfo/ds.shtml