Professor Sir Ernest Kennaway in the 1920s and 1930s identified the first carcinogens in smoke and coal tar
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The rest of the sales pitch began with talk of the paper absorbing more impurities from the smoke and making it smoother
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Data collection process, data items, and effect measures, data synthesis A custom-made data extraction form was developed, which included the following data items: general characteristics of the included studies (author and year, country, funding source, conflicts of interest, study design), population characteristics (sample number, demographics