Joe Carmel Camel's demand plummeted in the 1980s as it was perceived as a cigarette for older people
However, there still may be some bias (toward a positive association) from including all smoking status groups in the same model, especially if there is an unaccounted-for interactive effect between EC use and smoking history (such that those with longer smoking histories have higher health risks) which could falsely appear to carry over to PWNS
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Yoshida M, Minagawa S, Araya J, Sakamoto T, Hara H, Tsubouchi K, Hosaka Y, Ichikawa A, Saito N, Kadota T, et al
According to the CDC, environmental tobacco smoke is potentially carcinogenic to occupationally exposed workers, and mainstream smoke poses even greater risks to active smokers