All nic salt e-liquids that we stock have been checked, regulated and are entirely safe to use. It's important to remember that nicotine salts do contain nicotine, and are most commonly available in high strengths of 20mg. Whilst this is safe, we recommend only using high strengths if you are an ex-smoker who is used to consuming large amounts of nicotine. For anyone not used to these nicotine levels, this may result in discomfort or dizziness.