Shortfill e-liquids are nicotine free e-liquids that come in large bottles. Usually the bottles aren’t completely full (“short filled”) and give you room to add a nicotine shot.
Using nicotine shots is quick and easy:
Add a 10ml 18mg nic-shot to 50ml of e-liquid to give you 60ml of 3mg juice.
Add 2x 10ml 18mg nic-shots to 100ml of e-liquid to give you 120ml of 3mg juice.