put a piece of tape over their webcam. Truly paranoid ones worry about their devices’ microphones—some even crack open their computers and phones to disable or remove those audio components so they can’t be hijacked by hackers. Now one group of Israeli researchers has taken that game of spy-versus-spy paranoia a step further, with malware that converts your headphones into makeshift microphones that can slyly record your conversations.It seems that the hardware has a "feature" that allows software to turn an output channel into an input channel. Thanks, programmer-droid. Hope you die screaming in a crotch fire.
Bottom line, you can get spied on this way even if you plug your headset into an audio-out jack.
The longer I'm in this business, the more I feel like that guy in The Omen who locked himself in a room and wall papered it with bible verses. Didn't help him, either ...