Navigation Links
Global study shows all tobacco bad for the heart

A major Canadian-led global study has found all forms of tobacco exposure, whether that be smoking, chewing or inhaling second hand smoke, increase the risk of heart attack.

The study by professors Salim Yusuf and Koon Teo of the Michael G. DeGroote School of Medicine at McMaster University and Hamilton Health Sciences in Hamilton, is published in this week's issue of The Lancet.

In collaboration with colleagues from 52 countries, they calculated the risk of heart attack for various forms of active tobacco use (both smoking and non-smoking) and second hand smoking in all areas of the world. The INTERHEART study included data from more than 27,000 people in 52 countries. In their calculations, the investigators accounted for other lifestyle factors that could affect the heart attack risk, such as diet and age.

They found that tobacco use in any form, including sheesha smoking popular in the Middle East and beedie smoking common in South Asia, was harmful. Compared to people who had never smoked, smokers had a three-fold increased risk of a heart attack. Even those with relatively low levels of exposure of eight to 10 cigarettes a day doubled their risk of heart attack. Each cigarette smoked per day, increased the risk by 5.6 per cent.

However, the researchers did find that the risk of heart attack decreased with time after stopping smoking. Light smokers, those who consume fewer than 10 cigarettes a day, benefit the most. They have no excess risk three to five years after quitting. By contrast, moderate and heavy smokers of 20 or more cigarettes a day still had an excess risk of around 22 per cent, 20 years after quitting.

The team also found that exposure to second hand smoke increased the risk of heart attack in both former and non-smokers. The findings suggest that individuals with the highest levels of exposure to second hand smoke of 22 hours or more per week may increase their risk of heart attack by around 45%.

"Chewing tobacco also increased the risk of a heart attack two fold, indicating that all forms of tobacco use or exposure are harmful," said Dr. Koon Teo.

Dr. Yusuf said: "Since the risks of heart attack associated with smoking dissipate substantially after smoking cessation, public-health efforts to prevent people from starting the habit, and promote quitting in current smokers, will have a large impact in prevention of heart attack worldwide."

The number of smokers worldwide is currently estimated to be 1.3 billion, of which 82% are in developing countries. However, most large studies on smoking and heart disease to date have focused on developed countries.

"Smoking is the leading preventable cause of death, killing 47,000 Canadians each year through direct smoking and exposure to second-hand smoke," said Rocco Rossi, CEO, Heart and Stroke Foundation of Ontario. "We have been a successful advocate for a smoke free Ontario and have achieved one of the strongest pieces of anti-tobacco legislation in North America. This study provides more evidence why it's critical for everyone to become and remain smoke free, and will encourage governments to take effective action to protect their people from the dangers of tobacco."

"People around the world should pay attention to the message that it's never too late to quit. This is an important study documenting the powerful and persistent dangers of tobacco use worldwide," said Dr. Peter Liu, scientific director for CIHR's Institute of Circulatory and Respiratory Health (ICRH). "Canadians can be proud that we lead the world in efforts to prevent and reverse the trend in smoking. But we cannot rest on our laurels, and must do better still to protect our citizens."

"Data like this bolsters anti-smoking efforts worldwide," said Dr. Jennifer Everson, a family physician and vice president, medical at Hamilton Health Sciences. "It's important, additional evidence that we can sh are with our patients to help them make choices that could save their lives."

Source:McMaster University

Related biology news :

1. Global analysis of membrane proteins
2. Global warming increases oyster sensitivity to pollution
3. Grand Challenges in Global Health initiative funds Yale project
4. Global warming may warrant new approaches to ecosystem restoration
5. Global warming may have damaged coral reefs forever
6. Global malaria map key weapon in fight against malaria, scientists say
7. Global changes alter the timing of plant growth, scientists say
8. Global map shows new patterns of extinction risk
9. Global sunscreen has likely thinned, report NASA scientists
10. Global survey of lizards reveals greater abundance of animals on islands than on mainland ecosystems
11. Bioartificial kidney under study at MCG

Post Your Comments:

(Date:4/13/2017)... MONICA, Calif. , April 13, 2017 ... New York will feature emerging and evolving ... Summits. Both Innovation Summits will run alongside the expo ... of speaker sessions, panels and demonstrations focused on trending ... coast,s largest advanced design and manufacturing event will take ...
(Date:4/11/2017)... N.Y. , April 11, 2017 ... fingerprints, but researchers at the New York University ... College of Engineering have found that partial similarities ... security systems used in mobile phones and other ... thought. The vulnerability lies in the ...
(Date:4/5/2017)... 2017 Today HYPR Corp. , leading ... component of the HYPR platform is officially FIDO® ... security architecture that empowers biometric authentication across Fortune 500 ... secured over 15 million users across the financial services ... home product suites and physical access represent a growing ...
Breaking Biology News(10 mins):
(Date:10/7/2017)... ... October 06, 2017 , ... ... providing advanced instruments and applications consulting for microscopy and surface analysis, Nanoscience ... application consulting, Nanoscience Analytical offers a broad range of contract analysis services ...
(Date:10/7/2017)...  The 2017 Nobel Prize in Chemistry recognizes ... Joachim Frank and Richard Henderson ... (cryo-EM) have helped to broaden the use ... The winners worked with systems manufactured by Thermo ... resolved, three-dimensional images of protein structures that lead ...
(Date:10/6/2017)... D.C. (PRWEB) , ... October 06, 2017 , ... ... will host a lunch discussion and webinar on INSIGhT, the first-ever adaptive clinical ... Principal Investigator, Dana-Farber Cancer Institute. The event is free and open to the ...
(Date:10/5/2017)... , ... October 05, 2017 , ... Understanding the microbiome, ... frontiers in human health. Gut Love: You Are My Future, the newest exhibit on ... perspective as it explores the human condition through the lens of the gut microbiome. ...
Breaking Biology Technology: