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FeNo is a measure of airway inflammation[1][2], nothing more. It does not signify increased risk, harm, or any long term effect.
It indicates that, as is already well known, propylene glycol causes mild airway irritation. Given that use of ecigs has, in a small study, been associated with harm reversal in asthma sufferers[3], it would seem that the effect is transitory, and not of clinical significance, even in populations with existing risk factors.
Nothing more.
Claiming otherwise is disingenuous at best, and would generally be considered to be an out and out lie
[1] Using fractional exhaled nitric oxide (FeNO) to diagnose steroid-responsive disease and guide asthma management in routine care," title="";
[2] Fractional exhaled nitric oxide (FENO), lung function and airway hyperresponsiveness in naïve atopic asthmatic children," title="";
[3]Effect of Smoking Abstinence and Reduction in Asthmatic Smokers Switching to Electronic Cigarettes: Evidence for Harm Reversal," title="";

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