I sometimes spend hours lying in bed, propped up by a pillow with my laptop on my chest typing away. It’s pretty tricky and it takes some practice, for sure. I’ve been doing it for years and I’m pretty good at it. I don’t know what it might be doing to my lungs. I sometimes think about the possible side effects. I really don’t want to know, I guess, because I’ve never researched the subject. I’ve been doing this for at least twenty years. LOL. The damage is done. If I come down with lung cancer, I’ll let you know.