I've never used a VR headset, but I imagine that most of any discomfort would come from the headset's fitting closely around the face to block out ambient light

I've never used a VR headset, but I imagine that most of any discomfort would come from the headset's fitting closely around the face to block out ambient light. I'd think a true addict might instead just use a loosely-fitting non-light-blocking headset in a completely dark room.