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'Chelsy's father made a comment about 'cancer sticks' but she said she was old enough to do what she wanted.' Chelsy Davy (pictured) dated Prince Harry on-and-off between 2004 and 2011 Chelsy smokes at the Cartier International polo Final in Berkshire in July 2006 The pair broke up in 2011 - months before Prince William's wedding to Kate Middleton

Robertson placed groups of mice in a chamber and sprayed its air first with propylene glycol, then with influenza virus

After sex, when the body is in a heightened state of relaxation, smoking may counteract the benefits of increased blood flow and can lead to feelings of fatigue or lethargy

Cancer occurs when carcinogenic agents act on cells and alter their genetic material, producing a mutation

Nobody believes me! he cries