BMJ 2007;334:68 (13 January), doi:10.1136/bmj.334.7584.68-d
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Smokers should quit not reduce
Long term follow-up (mean 21.2 years) of 51 210 Norwegians examined in the mid-1970s showed no difference in mortality from all causes or from cardiovascular disease between the heavy smokers and the smokers who at baseline smoked heavily but then reduced their smoking level by at least 50% and maintained this reduction throughout the study period. Even the difference for lung cancer was not statistically significant. The authors conclude that advising heavy smokers to reduce may raise false expectations and that the only safe way to reduce risk is to quit.
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Tobacco Control 2006;15:472-80, doi: 10.1136/tc.2006.016246
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