As part of the Weed Care study, researchers in Basel, Switzerland, are investigating how the legal supply of cannabis affects consumption and mental health among participants. In a recent publication, the study team has now reported on the direct comparison of the substance's legal versus illegal procurement.
So, is the implication the one you might expect, that the “gateway drug” effect is real but due to having to buy it from sources that might sell other illegal drugs?
This part is a little confusing, like how do they tell what is the cause of difficulties? Do they mean these people were still buying other black market drugs in addition to getting weed from a pharmacy? If so what would be the reason for the improvement?