May 31 is World No Tobacco Day. Passive smoking often dubbed the 'silent killer' is more dangerous than you believe and the complications it creates have gone up like never before. 'Passive smoking is little talked about. But it's critical. Getting exposed to second-hand smoke is just as bad as active smoking and passive smokers often suffer from lung problems breathlessness and allergies' Ravindra L. Kulkarni a cardiologist and director of Just for Hearts an organisation for heart care and lifestyle management told IANS. The first global study on passive smoking estimated that it causes 600000 deaths every year. One-third