To be completely honest, Trueba et al. actually found that not only did taking an exam affect nitric oxide levels, but it also produced decreases in lung function measured by spirometry. This is something that has not been observed for electronic cigarettes.

In psychology, this phenomenon is known as . A 2010 Boston Globe describes this phenomenon and explains how when people are affected by this bias, they twist new facts that run counter to their position in order to fit with their pre-determined conclusions, rather than change their positions in line with the new information.

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