A new study by researchers from the Sungkyunkwan University School of Medicine, Korea, showed that secondhand smoke exposure was significantly associated with hypertension (high blood pressure) in never-smokers, suggesting that necessity of health program and stricter smoking regulation to reduce the risk of hypertension.
“Our study in non-smokers shows that the risk of hypertension is higher with longer duration of passive smoking — but even the lowest amounts are dangerous,” said Professor Byung Jin Kim, lead author of the study.
“Previous research has suggested a link between passive smoking and hypertension in non-smokers. But most studies were small, restricted to women, and used self-reported questionnaires in which respondents typically over-report never-smoking.”
This is the first large study to assess the association between secondhand smoke and hypertension in never-smokers verified by urinary levels of cotinine, the principal metabolite of nicotine.
It included 131,739 never-smokers, one-third men, and an average age of 35 years.
Passive smoking at home or work was linked with a 13% increased risk of hypertension. Living with a smoker after age 20 was associated with a 15% greater risk.
Exposure to passive smoking for ten years or more was related to a 17% increased risk of hypertension. Men and women were equally affected.
Participants with hypertension were significantly more likely to be exposed to secondhand smoke at home or work (27.9%) than those with normal blood pressure (22.6%).
Hypertension was significantly more common in people exposed to passive smoke at home or work (7.2%) compared to no exposure (5.5%).
“The results suggest that it is necessary to keep completely away from secondhand smoke, not just reduce exposure, to protect against hypertension,” Professor Kim said.
“While efforts have been made around the world to minimize the dangers of passive smoking by expanding no smoking areas in public places, our study shows that more than one in five never-smokers are still exposed to secondhand smoke.”
“Stricter smoking bans are needed, together with more help for smokers to kick the habit. Knowing that family members suffer should be extra motivation for smokers to quit.”
Byung Jin Kim et al. Association between secondhand smoke exposure and hypertension in 131,739 Korean self-reported never-smokers verified by cotinine. EuroHeartCare 2019, abstract #18