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"How Safe are Electronic Cigarettes?"

The I 2 statistic and its CI was also calculated to reflect the overlap of individual studies CIs

He wondered whether its psychedelic carvings were influenced by betel nut use

Although the relative risks derive from studies of non-smokers with current partners who smoked, the corresponding estimates of PAF in Table 5 (column 6) are probably an underestimate, because of the following factors: They take account only of current partnerships, and it is likely that past partnerships with a smoker would have had some adverse effects, particularly when separation had occurred only recently Some non-smoking partners may have quit relatively recently, and their past smoking would have had an adverse effect There may be other members of the household smoking, even though the partner does not