Well this is what happened in Portugal, from wiky:
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Increased uptake of treatment (roughly 60% increase as of 2012.)[12]
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Reduction in new HIV diagnoses amongst drug users by 17%[19] and a general drop of 90% in drug-related HIV infection
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Reduction in drug related deaths, although this reduction has decreased in later years. The number of drug related deaths is now almost on the same level as before the
Drug strategy was implemented.[12][19] However, this may be accounted for by improvement in measurement practices, which includes a doubling of toxicological
autopsies now being performed, meaning that more drugs related deaths are likely to be recorded.[20]
-Reported lifetime use of "all illicit drugs" increased from 7.8% to 12%, lifetime use of cannabis increased from 7.6% to 11.7%, cocaine use more than doubled, from 0.9% to
1.9%, ecstasy nearly doubled from 0.7% to 1.3%, and heroin increased from 0.7% to 1.1%[19] It has been proposed[by whom?] that this effect may have been related to
the candor of interviewees, who may have been inclined to answer more truthfully due to a reduction in the stigma associated with drug use.[20] However, during the same
period, the use of heroin and cannabis also increased in Spain and Italy, where drugs for personal use was decriminalised many years earlier than in Portugal [20][21] while
the use of Cannabis and heroin decreased in the rest of Western Europe.[22][23] The increase in drug use observed among adults in Portugal was not greater than that seen
in nearby countries that did not change their drug laws.[24]
-Drug use among
adolescents (13-15 yrs) and "problematic" users declined.[20]
-Drug-related
criminal justice workloads decreased.[20]
-Decreased street value of most illicit drugs, some significantly
-The number of drug related deaths has reduced from 131 in 2001 to 20 in 2008.[25] As of 2012, Portugal's drug death toll sat at 3 per million, in comparison to the EU
average of 17.3 per million.
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Homicide rate increased from 1.13 per 100 000 in 2000 to 1.76 in 2007, then
decreased to 0.96 in 2015 [26][27][28]
Prohibitionism is just wrong especially when all the government says is "hey dont use that drug, that drug is bad, use this one*, this one is cool and taxed by the state
."
*weed tobacco and alchool are as bad as the other drugs, just because you pay taxes and you can buy them easily doesent mean they do less harm.