Well, after loads of really helpful posts telling you to give up...
I'd agree with Smurfin.
I, and my girlfriend, have smoked whilst watching movies, and I have a roaring fire going in my lounge during winters!!!
Now, I know it is bad for my projector, but a year and a bit later, when avia'd, it does not seem too bad.
Buy a cheap projector, enjoy watching it more when smoking, realise you'll need to replace it 6 months earlier than if you didn't smoke, and then stick it on ebay, and get another.
what percentage of people on this forum don't wear glasses of the right prescription, eh?
AVs meant to be fun, smoke away