Effect on mortality of switching from cigarettes to pipes or cigars. Study underestimated difference in risk.
O'Driscoll
B R
BR
D002755:Choice Behavior; D006801:Humans; D008175:Lung Neoplasms / Q000401:mortality*; D008297:Male; D018570:Risk Assessment; D012307:Risk Factors; D012907:Smoking / Q000401:mortality*