Anon smokes in his room

Actually, they kinda can. Most often the smoke tars up the fans and you get overheating problems, but sometimes it'll even mess up other internal electronics. But yeah, if you consider the fans to be the "lungs" of the computer, smoke can give computers "lung damage"

Smoking does mess your stuff up. I've wrecked a few electronics by overheating

If you smoke near Apple computers for example, their warranty is revoked