http://en.wikipedia.org/wiki/Vegetarianism#Longevity
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However, the "lower mortality was due largely to the relatively low prevalence of smoking in these [vegetarian] cohorts". Out of the major causes of death studied, only one difference in mortality rate was attributed to the difference in diet, as the conclusion states: "vegetarians had a 24% lower mortality from ischaemic heart disease than non-vegetarians, but no associations of a vegetarian diet with other major causes of death were established."
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lower cholestoral and a correlation to lower smoking!
i.e. if you examine vegetarians who smoke they get cancer exactly the same as meat eaters!