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Many users chew on this for hours, thereby ingesting a steady stream of nicotine throughout the day

Crawford Moodie is senior research fellow, Centre for Tobacco Control Research, Institute for Social Marketing, University of Stirling

My Rating System Explained I score each purifier on a 10-point scale across six categories, weighted by importance for smoke removal: Why this weighting

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Thus, for any value of x there is a unique value of y