New research shows that cigarettes kill 2/3 of its users after examine 20,500 people
Investigators from Australia followed 204,953 smokers, past smokers, and never smokers over 45 years old. In 4.26 years, 5,593 deaths occurred among the study population, up to two-thirds of deaths can be attributed to smoking.
Results from this study indicates the mortality rate for male and female smokers to be 2.76 and 2.95 times higher never smokers. After quitting, male and female past smokers has 1.27 and 1.39 higher mortality rate than never smokers.
On average, smokers die around 10 years earlier than non-smokers. Mortality rates increased substantially with increasing intensity of smoking -- a two-fold increase with 1-14 cigarettes per day and a four-fold increase with more than 25 cigarettes per day.
img src: http://goo.gl/Q9EHfk