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[15] [16] [17] In addition, a number of Canadian provinces are teaming up to sue tobacco companies to recover healthcare costs caused by smoking

'Why smoking impairs the ability to learn about safety is not clear, but one possibility is that smoking changes neurotransmitter balances in the brain, which are necessary for successful safety learning.' Dr Haaker and his colleagues now hope to unravel the mechanism underlying this effect with the hope of developing new treatments and perhaps even new drugs

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Because of its dynamic nature, a specific quantitative definition of secondhand smoke cannot be offered