Apstiprinājumu neradu, bet ticami. Tvenam ar smēķēšanu bijušas visnotaļ tuvas attiecības:

As an example to others, and not that I care for moderation myself, it has always been my rule never to smoke when asleep, and never to refrain from smoking when awake.

Tā kā Tvens apgalvoja, ka atmest smēķēšanu ir vienkārši (esot to darījis neskaitāmas reizes), tad visai ticami :)