Freebase nicotine is the original nicotine in e-liquids. It creates a strong throat hit, which can feel a bit too strong at super high nicotine strengths. Nicotine freebase feels harsher on the throat, and suits people who prefer that feeling or who like to puff little and often throughout the day.

What's the difference between freebase and salts?

There are two types of nicotine e-liquids: nicotine freebase and nicotine salts. Freebase is the standard one, salts is the newer one that has less of a harsh hit and is available in higher strengths.

Do e juices have nicotine?

The "e-juice" that fills the cartridges usually contains nicotine (which is extracted from tobacco), propylene glycol, flavorings and other chemicals. Studies have found that even e-cigarettes claiming to be nicotine-free contain trace amounts of nicotine.