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It also means the heroin smells a little weird, like ammonia

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

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

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Furthermore, police departments in some cities have trained Drug Recognition Experts who are specially trained to recognize impairment from drugs other than alcohol