The study Bobert recollects exists. One report about it is for instance here.

But I wouldn't take it very serious. For instance, pipe smokers and cigar smokers in Germany live longer than non-smokers. Does that come from smoking pipes and cigars being healthy? No, it comes from pipe smokers and cigar smokers being members of a population (white collar, higher education, higher income) that lives longer (even if smoking) than workers and (other) poor people.

Wolfgang