Information and education are the answer. Let people do as they will. Hold them accountable for their behaviour but let them do it. The prohibition of drugs has caused far more harm than it has prevented. The vast majority of the violence associated with illegal drug use is caused by prohibition. 30,000 dead in Mexico.
And your point is proven by those clinics that have the possession of drugs decriminalized. Those clinics offer fresh needles, a bright light mirror, nurse and doctors staff if anything goes wrong all the junkies have to do is bring their own "stuff". Their aim is to limit the loss of life to drugs, and to try to convince people to stop they have a lot of success in both cases.
And if the buying and selling of drugs where decriminalised there would be no need for gangs no need to bring tones of firepower to a deal because the deal would be protected by law and contract if one of the parties involved would try to cheat the other there would be no need for a bloodbath because they could sue and get their money or drugs back.
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