At least thats what I was told as I was prescribed drops to make it better
[29] Ko TJ, Tsai LY, Chu LC, Yeh SJ, Leung C, Chen CY, Chou HC, Tsao PN, Chen PC, Hsieh WS.Parental smoking during pregnancy and its association with low birth weight, small for gestational age, and preterm birth offspring: a birth cohort study
To convert this percentage to the mg/ml used for standard e-liquids, you simply multiply the percentage by 10
I chose them as they are my most prized and best smoking pipes: JoMil from USA From top left to right (I may change the order when I smoke them during System Week depending on the tobacco I chose each day): Sherlock Holmes Mycroft with P-lip in terracotta (wonderful in the hand)