Your Smoke Pencil comes with a 85ml supply of glycerine-based fuel, which will last for hours, but when this finally runs out you can replenish it with the refill fluid and keep using the Smoke Pencil for years. Remember to empty the tank when you’ve finished using the Smoke Pencil, mainly to stop it from leaking out when it’s being stored. The heating process generates water as a by-product and this can be extracted using the squeezy mechanism in the bottle and mixed back in with the mainly water-based fuel.
