No one is in any doubt that smoking kills and for half a century the Royal College of Physicians has been warning of the damaging health consequences of nicotine consumption and addiction. They continue to campaign for higher prices and tougher laws on advertising and packaging to curb consumption - even today one fifth of the adult population smokes. Smoking continues to kill around 100,000 Britons each year and unless smokers give up their habit, 100 million years of life will be lost in the UK, according to experts. Channel 4 news reports on changing social norms and the battle to change behaviour. A good historical perspective on information gaps.

BBC News: Fifty years since landmark smoking report