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After 1992, packaging remained unchanged until 2002, when the flowers were replaced by butterflies (gen

Ecigarettes users still may be able to obtain similar blood nicotine levels compared with traditional cigarettes, particularly with experienced smokers, but it takes more time to obtain such levels

Subjects with mild, moderate, and severe COPD were just as likely to try and continue to use e-cigarettes as those without COPD (Figure S1)

Most of the items were collected between 1993, when Bonner first visited North Korea, and 2005, when digital design methods started becoming more widely available

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This allowed us to ensure full impartiality and gave us a set of results that allowed us to draw direct comparisons between EDGE products, three leading brands of cigarettes and three heated tobacco products