Use a nicotine shot (AKA "Nic Shot") to add nicotine to "short-fill" e-liquid.
The short-fill e-liquid itself is nicotine-free, so you can simply use "as is" if you're looking for zero nicotine e-liquid. Should you prefer however - you can your desired nicotine strength. For example - a 100ml of e-liquid, actually has space for 120ml - which is why it's known as a "Short Fill". So you simply add 20ml of your desired nicotine shot (AKA "Nic Shot") to the bottle and give it a thorough shake to complete the mix.
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