Smoking Kills... Your Warranty
Smoking will void your warranty. Well, not yours, but the warranty that comes with your Apple device. However, the referenced article attempts to create the impression that Apple refused to acknowledge the warranty claims because of potential health issues for its service personnel (as that is also what a couple of customers were told), but seems to mostly ignore the fact that over time cigarette smoke leaves plenty of residue [CAUTION: Explicit images, not for the faint-hearted!] on any surface it gets in touch with. I am almost certain that optical disk drives as well as heat sinks and fans would be especially affected by this. A brief Google search did not yield any results hinting at whether smoke deposits are conductive. However, if that would be the case the effect on computer hardware would be even worse.
So, why should Apple be obliged to repair a device under warranty that has been damaged by a certain practice at the user’s discretion? Nobody would request a warranty repair of a computer device that has been dropped into and consequently damaged by water…