ford fiesta cigarette lighter always on Why does it not turn off when I leave the engine? : r/FordFiesta 2012 Fiesta - Cigarette lighter

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The best way to put out a lit cigarette or joint is by stubbing it in an ashtray or by dousing it in water

get your car checked by a professional to avoid further problems

But unless nicotine is pretty much eliminated quickly and comprehensively in all available tobacco products which seems unlikely it runs a serious risk of making things worse as smokers smoke cigarettes harder in order to get the nicotine they need, leading to more exposure to the harmful tar. Linda Bauld, deputy director of the UK Centre for Tobacco and Alcohol Studies and professor of health policy at the University of Stirling agreed that the move could end up exposing smokers to higher levels of toxins