Unless you're hanging a CRT you really don't need to bother screwing into the studs. Get the right type of plug and you can hang some pretty absurd weights from drywall, especially if most of the force is straight down like it would be with a tv mount. I really like the screw-in type plug. Easy to install, no possibility of the toggle not toggling or whatever.
If you want to mount one of those extendo-mounts I'd probably bother to screw it into the studs though, to be fair.
Man if only that was true. A neighbor across the street is a chain smoker, and I hear him hack up a lung every morning for a couple of hours.
Yeah smoking will make you live shorter, but it'll also reaaaally fuckin' ruin your life leading up to that.