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Diacetyl, a chemical which is used as a butter substitute in flavours like Cotton Candy and Cupcake, has been linked to respiratory disease bronchiolitis obliterans Although it is thought to be safe when eaten, the United States National Institute for Occupational Safety and Health has said it could be hazardous when inhaled over a long period

Smoking can according to a study earlier lead to grey hair even before turning 30 years old

doi: 10.1289/ehp.1509703 39 RosenEDSpiegelmanBM

Influence of five different postnatal lifelong treatments on the transplacental carcinogenicity of ethylnitrosourea in SpragueDawley rats