Airport staff found traces of cigarette ash in the toilet at Gate 34 and discovered the smoke alarm had been stuffed with toilet paper in a failed attempt to disarm it.

BBC: Airport evacuation smoker acquitted

Kafkor, sucking on the cigarette, became aware of the ash, too.

NPR: Excerpt: 'Legends'

With an e-cigarette your nicotine is delivered with propylene glycol and vegetable glycerin rather than tar and ash.

FORBES: Will E-cigarettes Become A Taxing Experience ?