사망률을 살펴보면 발병 전후 지속해서 흡연한 그룹은 발병 전후 모두 금연한 그룹에 비해 사망위험이 1.6배에 달했다.
If you look at the mortality rate, those who smoked before and after the outbreak had a 1.6-fold higher risk of death compared to those who quit smoking both before and after the outbreak.