The first and only time I overdosed on nic was a few weeks ago when I put a few used cartos into boiling water to clean them. The cartos were not empty from nic content... and I happened to inadvertently take a direct breath of the vapor coming from the pot...
... it gave me a huge headache that didn't lasted long though, and I felt uncomfortable and almost had nausea. I was afraid for my cat's health (they are very sensible to nicotine I heard) so I opened a window and put the cat in another room.
Since this incident I am overly cautious with everything nicotine-related - I wear gloves and masks and I look like a worker from the Robocop drug factory.
If only everyone was aware that it is VERY dangerous to play with nic. I am sure that a stupid vaper will eventually kill himself and it will stir poodoo in the community. Please don't be that priick and be careful.