You are correct that the "authorities" do not recognize property rights in commodities that have been legally defined as "contraband", and that is the real problem: By forcibly preventing normal markets for these commodities to develop, ostensibly to protect us from their harmful effects, the drug warriors have ironically caused waves of serious crime. Foolish as one may think pot-smokers are, they tend to be rather placid and harmless. That does not mean that all is well, because the dealers can and do engage in turf-wars, enticing ever younger children to carry their products, and where possible, concentrating and "enhancing" their products to generate a larger customer base. They also engage in bribery and subornation to protect themselves from law enforcement.
This is as opposed to open market merchants who carefully follow the relevant laws in order to minimize extraneous costs arising from violations, since they operate openly and with intense scrutiny from watchdog organizations, customers, and competitors.
The difficult truth here is that in a market environment, attempts to interdict supply generally fail and result in drastically negative unintended consequences. A better approach would be to attempt to reduce demand, possibly via education and restrictions on distribution to minors. This approach will peacefully minimize problems with the commodity in question, but cannot be expected to completely eliminate demand.
So go do it and render the laws moot.