smoke 2 cigarettes a day Many people think smoking only on the weekends or at parties is harmless, but doctors warn there is no safe amount of tobacco. Find out how even occasional smoking damages your heart Doctor advised my friend to

Some systems can carry smoke further than you think, while others might dilute it enough to sneak under the radar.The type of detector matters too, big time

Scientists do not yet know the long-term effects of e-cigs because they are so new to the market, but coupled with the knowledge that formaldehyde is not healthy, the latest study could be a game-changer in the perception of e-cigarettes as an alternative to smoking tobacco leaves.

Professor Stephen Holgate of the University of Southampton who was not involved in the study said: " It has been known for some time that in those genetically susceptible to emphysema, cigarette smoking and air pollution accelerate their development of emphysema." He added: "This important study adds to the massive evidence base that air pollution, in this case specifically ozone, is harming people, especially those who are vulnerable with co-existent lung disease." Patient picks for Pollution General health and lifestyle How air pollution affects your health UK Prime Minister, Rishi Sunak, has delayed banning the sale of new petrol and diesel cars from 2030 to 2035

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