"Apple has a "Smoking" ban on their computers, meaning if you somke while using any apple computers, the warranty become void."
The first case involved a Mid-2007 MacBook under APP that was brought to the Jordan Creek Apple Store in West Des Moines, Iowa, for overheating. Apple voided the warranty because the computer was used in a house where there was smoking. It also refused to work on the machine due to the "health risks of second hand smoke."
Another case involved an iMac under APP that Apple refused to work on because it was deemed "contaminated" by tobacco smoke and and considered a "bio-hazard."
Apparently Nicotine is on OSHA's list of hazardous and toxic substances (although I couldn't find it) and Apple will not force an employee to work on anything deemed hazardous to their health because of the obvious legal exposure that could create.
Since Apple doesn't disclose anything about smoking in the North American terms and condition of the APP, users who were denied coverage should – at minimum – receive a refund of cost of the warranty. Those that have been denied warranty coverage due to exposure to smoke could also sue Apple for not honoring its agreement.