Most vendors list the strength of their juice by mg strength of the entire bottle...0mg, 8mg, 16mg, etc. Puresmoker uses a more accurate measurement by listing their juice in percentage of nic per ml. They have 5 strengths: 0.0%, 0.8%, 1.6%, 2.4% and 3.2% which correlates in mg to 0mg, 8mg...