As somebody who's worked on PC's that belong to smokers... it is nasty.
It comes in, and it's all yellowed. I'm not even sure if they realize it's yellowed when it comes in, but that nice beige color is no more.
You turn it on, and you can smell cigarrettes. It's inside the PC and it comes right out the exhaust fan. Nasty.
And then heaven help you if you actually have to open it up. PC's collect a lot of dust. Dust acts as a nice old net for cigarette smoke. The dust, too, is all yellowish brown and it smells even worse than the exhaust.
And then there's this fine layer of some sort of oily grime all over everything.
I've actually called customers up and told them to come pick their PC's up because I refused to work on it with it being as absolutely filthy as it is. I mean, don't get me wrong, I've seen some really dirty PC's that had never come in contact with cigarette smoke, but the smoke definitely makes it an unbearable mess. It was one of the reasons I wanted out of the public PC arena.
I can't help but look at a PC like that and wonder what that person's lungs must look like.
And now a question for you smokers. One thing that's always bothered me about them (in general - nothing personal). They are the laziest bunch... They're not allowed to smoke indoors. So the go outdoors. But can they be bothered to walk a few feet away from the door before lighting up? No. They stand right in front of the door. Not only does everybody else have to smell what they're smoking, but we can't even get through the doorway without having to squeeze past. The same thing bothers me when it's just two people who know each other bump into each other in the doorway and decide that it's the perfect place to chat. The smoking just exacerbates the whole situation. So what's up with that? Is it really so hard to just walk away from the door a little ways?
And why is it that smokers can get a 10 minute cigarette break every hour or so, but non-smokers get yelled at for standing around doing nothing?