It's not the nicotine build-up that I'd be concerned with. It's more the tars that can embed anywhere the smoke travels. If you can smell it, it's still there. Most car rentals that allow smoking, can not get rid of the smell when they sell the car. The same is true for with hotel rooms. They have to repaint, change all the matresses, curtains and rugs. The computer industry has always known that smoking affects the keyboards and other electronic circuitry. That's why Silicon Valley was banning smoking at the worksite before anyone else did. Ironically, it wasn't to protect the health of the workforce, but more importantly, the health of their chips. Priority boys, priority!