Doug Manuel, The Ottawa Hospital (IMAGE) The Ottawa Hospital Caption Dr. Doug Manuel was senior author of a study that found that smoking, poor diet, physical inactivity, and unhealthy alcohol consumption contribute to about 50 percent of deaths in Canada. Credit The Ottawa Hospital Usage Restrictions This image is only to be used in pieces pertaining to this research study License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.