A radical scheme to vaccinate children against future drug addiction is being considered by British ministers, The Independent on Sunday can reveal. Under the plans, doctors would immunise children at risk of becoming smokers or drug users with an injection. The scheme could operate in a similar way to the current nationwide measles, mumps and rubella vaccination programme. Childhood immunisation would provide adults with protection from the euphoria that is experienced by users, making drugs such as heroin and cocaine pointless to take. Such vaccinations are being developed by pharmaceutical companies and are due to hit the market within two...