Drinking alcohol is more harmful than taking drugs like heroin or crack, according to a study published in medical journal The Lancet. The report, co-written by the former chief drugs adviser David Nutt, ranks 20 drugs on 16 measures of harm to users and wider society. Each drug was scored for harms including mental and physical damage, addiction, crime and costs to the economy and communities. Heroin, crack and methylamphetamine were the most harmful drugs to individuals, but alcohol, heroin and crack cocaine were the most harmful to others. Professor Nutt, who was sacked by the previous Labour government, said: "What a new classification system might look like would depend on what set of harms to self or others, you are trying to reduce. "But if you take overall harm, then alcohol, heroin and crack are clearly more harmful than all others." Prof Nutt refused to leave the drugs debate when he was sacked from his official post by the former Labour Home Secretary, Alan Johnson. He went on to form the Independent Scientific Committee on Drugs, a body which aims to investigate the drug issue without any political interference. One of its other members is Dr Les King, another former government adviser who quit over Prof Nutt's treatment.