Vampire Vape noticed how great the recipes for their freebase e-liquid are (like Heisenberg), and has created nicotine salt versions. Nicotine salts are just a type of nicotine that has been chemically altered with a type of acid (usually benzoic) to alter the PH. This makes inhaling nic salts smoother on your throat and makes sure you receive nicotine quickly for a great hit, so is a good bet for people wanting to quit smoking. Heisenberg can now be vaped as a nic salt up to 20mg, so if you think nic salts suit you better then you can still enjoy your favourite flavours.