yeah i get what you are saying. I'm in UK.. We are undergoing the same thing as you i think. Small possession is never enforced of any drug. You can get away with growing 9 plants for your own use. but if they catch you you will lose it and equipment.
In a teal free world it would all be available and stopping what you mentioned with immigrant gangs. We have same problem especially with heroin and cocaine. I buy things from Holland on occasion because we are in customs union..When we leave EU i don't think that arrangement will change that much..