As we grow older, lots of women worry about their boobs starting to sag. But it's not all down to age, as the way we live actually effects the perkiness of our breasts
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Does smoking make breasts sag faster than normal by breaking down a protein in the skin called elastin, which gives youthful skin its elastic appearance and supports the breast? - Quora
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What happens when you stop smoking - the rapid change in your body once you stamp out your last cigarette - Mirror Online