The smoke released during the combustion of tobacco is not a homogeneous substance. It contains about 4,000 different items that occur in gaseous or solid. Even today, all these substances are not known, nor is their effect on human health. The person who smokes a pack of cigarettes per day absorbs 6 kg of dust (= 10 briquettes) in twenty years and a cup of tar per year. Before being eliminated by the body, all this “dirt” y leaves toxic deposits that cause organ damage sustained.
When Apple refused to provide redress in accordance with the contract of guarantee, showing reason: the Mac was “contaminated” by cigarette smoke, the Smokey-geeks got astonished. Apple said, nicotine is considered a toxic substance referenced in the list of hazardous substances from the Occupational Safety and Health Administration (OSHA).
It is matter of fact, smoke causes direct injury for the hardwares of your Windows based computer too! both are computers: whether it is a Mac or a PC.
---
How much deleterious the cigarette smoke can be for computer hardwares? Here are proofs:

Let us see the computers heat sink closely:

(Photo courtesy: ryansccs.com)
Whether the filter of cigarette causes Mesothelioma or not, it is a different question. But certainly the smoke, particles causes harm to the hardware particles.
The tar may cause some components unusable too.
Tagged With Computer Supply Boom Smoke , FOTOWRZUT P , What not to do infront a Computer?