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No significant effects were detected of gender [B=0.087, p=0.180], race/ethnicity [B=0.150, p=0.159], or HSI score [B=0.031, p=0.127]
The chemicals can even contaminate dust
The five companies represent about 97 percent of the e-cigarette market, according to the FDA
If you or a loved one need help to quit smoking, chewing or vaping, talk to your doctor
Mr McGrady told the BBC News website: "We think the evidence is now so strong that it's likely we're witnessing the globalisation of plain packaging - particularly after countries as influential as the UK, France and Australia have implemented the measure