Nicotine overdose

Nicotine overdose occurs when the nicotine strength is too high. Nausea and headaches are the main symptoms. This sometimes happens to beginners to vape, as the body is slower to absorb nicotine from e-liquids than from tobacco. So you vape a lot and sometimes you may have absorbed too much nicotine. All that's left to do is vaporise less or lower your nicotine strength.
The advantage of these symptoms is that your body tells you straight away if you've overdosed on nicotine.