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We understand the physical effects of tobacco so well, but were much less sure about why these associations come about

But research has shown that tobacco companies appeared to delay introducing plain packs, continued to explore ways to promote products and did not follow through with their predictions that prices would decline

According to a July 2013 Gallup poll, just 19% of Americans said they had smoked a cigarette in the prior week, marking the lowest level in the poll's 69-year history

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To investigate this further, a team of researchers led by Professor Allan Hackshaw at the Cancer Institute at University College London analysed the results of 141 studies and estimated the relative risks for smoking one, five, or 20 cigarettes per day