Tomorrow is World No Tobacco Day. And here's something that should make you sit up and listen or stub the butt. Smoking is THE most important cause of premature heart attacks, with India having about 4.5 crore patients with ischemic heart disease, doctors warned today. 

According to the World Health Organisation, tobacco use is one of the biggest public health threats worldwide which kills nearly six million people a year of whom about 600,000 are non-smokers exposed to second-hand smoke. 

And the situation in India is very alarming as around 10 lakh deaths are caused by tobacco every year, with the WHO 2012 Global Report on Mortality claiming seven per cent of all deaths for people aged 30 and over in India are attributable to tobacco. 

It is widely believed that tobacco use, especially smoking, causes chronic bronchitis and lung cancer, but many may not know that it is actually the most important cause of premature heart attacks.