It's tobacco and alcohol use - not illegal drugs - that may pose the greatest risks to health. A new international study found alcohol and tobacco use combined cost more than a quarter of a billion disability-adjusted life-years worldwide, while illegal drugs only accounted for tens of millions.

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It's tobacco and alcohol use - not illegal drugs - that may pose the greatest risks to health. A new international study found alcohol and tobacco use combined cost more than a quarter of a billion disability-adjusted life-years worldwide, while illegal drugs only accounted for tens of millions.