The research team prospectively collected data from the Framingham Heart Study. In this retrospective analysis, there were 3805 original participants (1954- 1958) and 4965 follow-up participants (197 1- 1975). All participants had no cardiovascular disease before joining the group.
In this study, heavy smokers are defined as smoking at least one pack of cigarettes a day for 20 years or more.
The average age of 8770 participants was 42.2 years old, 45% were male, and 5308 people smoked. The average smoking age was 17.2 years old, of which 237 1 were heavy smokers. After a median follow-up of 26.4 years, * * * 2435 participants had CVD events, including 1095 heavy smokers.
The incidence of CVD per 65,438+0,000 person-years in five years for those who quit smoking was 6.94%, which was significantly lower than that of those who did not quit smoking (65,438+0.56%). After quitting smoking 10- 15 years, the annual incidence of CVD per 1000 people is 6.3 1%, which is still higher than that of never smokers (5.09%).
Among heavy smokers, those who quit smoking within 5 years have significantly lower CVD risk than those who have not quit smoking, but they are still higher than those who have never smoked.
Text | China Science News Xiaoke Robot