Here is a rough guide I found at
*NEW* 1000ml Bottle of Flavored Nicotine E-Liquid E-Juice | E-9 Style Electric Cigarettes
...
The E-Smoking Liquid has these different levels of nicotine to choose from:
* Super High density of nicotine: 36 mg nicotine, which is equivalent to Super Strong Cigarettes. (we are the only company that still offers 36mg
eliquid)
* Extra High density of nicotine: 24 mg nicotine, which is equivalent to Extra Strong Cigarettes.
* High density of nicotine: 16 mg nicotine, which is equivalent to Regular Strength Cigarettes.
* Medium density of nicotine: 11 mg nicotine, which is equivalent to Medium Strength Cigarettes.
* Low density of nicotine: 6 mg nicotine, which is equivalent to Ultra Light Strength Cigarettes.
* Non density of nicotine: 0 mg nicotine, which is equivalent to No Nicotine.