If you read the same paper, you will see that while this statistic MAY (or may not... depending on which journal you read) be correct, high percentages of other smokers die of other related diseases, such as mouth cancer, bowel cancer and heart disease.
Some other quotes for you:
"between 1950 and 2000, tobacco use will have caused about 60 million deaths in developed countries alone"
"In 1990, 35 percent of deaths in middle-aged men (ages 35-69) and 12 percent of deaths in middle-aged women was attributed to smoking, causing on average 22 years of life lost per deceased smoker"
I think this one is the most telling:
"Among both women and men, never smokers had much better survival rates than smokers in all social positions. Smoking itself was a greater source of health inequality than social position and nullified womens survival advantage over men. This suggests the scope for reducing health inequalities related to social position in this and similar populations is limited unless many smokers in lower social positions stop smoking."
