They dont contain nicotine and produce distinct aromas
Of those, 39 publications 16,31,32,33,34,35,36,37,38,39,40,41,42,43,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,65,66,67,68,69,70 including 847 participants reported the number of males (573, 67.7%) and females (274, 32.3%)
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We did not estimate RRs separately for different locations, sexes (although the RR of prostate cancer was estimated only for males and of cervical and breast cancer only for females) or age groups (although this analysis was applied to disease endpoints in adults aged 30 years only and, as detailed below, age-specific estimates were produced for the five CVD outcomes)