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International action, under the auspices of the UN, and implemented in all countries to legalise all drugs would have several immediate beneficial effects.
Illegal growers and traffickers would be replaced by proper businesses, possibly using the same personnel in some cases.
Proper quality controls would reduce harm from bad practices and ingredients.
Many addicts would be sustained in their habits, but become productive members of society. Doses would be controlled and gradually reduced when possible, under the control of qualified professionals, available in all locations necessary.
Taxes raised by the legalised trade would ensure adequate funding for research and provision of clinics, professionals etc.
Crime relating to trafficking would disappear overnight.
Drug accidents would reduce and hospitals and health services would be freed up to deal with other problems.
Health of addicted individuals could be improved as part of treatment; correct eating, exercising etc.
Billions of dollars, spent on police, armed forces and courts would be immediately saved and diverted to rehabilitation of addicted people.