Thanks to their auto draw function, the disposable Crystal vapes are amongst the easiest devices to use. Each disposable vaping device is pre-filled with e-liquid (nic salt liquid) and also houses a pre-charged battery. This means there's no need for maintenance. The inhale-activated technology allows you to puff on the device and the mesh coil will heat the nic salt liquid and turn it into an inhalable vapour, for a smooth nicotine hit. It couldn't be simpler!