It was found that some Chinese made eCigarettes and their USB charging cables, have been made with malware built right in. When plugged into a computer, it phoned home. Is this a true story or a hoax? Hard to tell as the story broke on Reddit.
Since the proof of concept code for BadUSB came out, this story is believable.
How you can protect yourself:
Get an external USB charger, it doesn’t plug into your computer, like this USB charger.