You may be interested in Portugal's drug policy which has become an example of what you're suggesting. Laws were relaxed in 2001 together with increased support

You may be interested in Portugal's drug policy which has become an example of what you're suggesting. Laws were relaxed in 2001 together with increased support and therapy. Statistics suggest that drug use and related problems have reduced since then: https://en.wikipedia.org/wiki/Drug_policy_of_Portugal https://en.wikipedia.org/wiki/Drug_policy_of_Portugal