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Decriminalization and legalization brings peoples addiction out of the kind of hiding that prohibition requires. This makes it easier and safer for people to seek addiction services, and easier for their loved ones to spot their problematic use earlier. Portugal is testament to this.

Also consider places like the Netherlands or various states in the US where cannabis is legally available. What you see there is that other drug use shifts to cannabis which is relatively safer than alcohol or opioids. You also see declining rates of use among teenagers as it become less mysterious and dangerous but rather common and uncool.