The strength of e-juice generally depends on what you currently smoke or where you are in your cessation efforts if you are attempting to end nicotine use altogether. E-juice comes in high strength (18-24 mg.), medium strengths (11-16 mg.) or low strengths (0-6mg.). It is suggested that you start in the middle range if you are not sure and move up or down according to preference. If you normally smoke a regular strength cigarette, you may like anywhere from 16-24 mg. If you smoke lights, 11-16 is usually sufficient, and if you smoke ultra lights, 6-11 mg. is usually good. At any time you feel nauseated, light-headed, dizzy, or develop a headache you need to decrease your nicotine strength. You may need to discontinue use if problems persist or you may try switching to a VG based e-juice. On rare occasion people are allergic to the PG base and not reacting to the nicotine strength levels. *Please note, what we are sharing with you here is not to be substituted for your doctor’s advice. If you experience any of the mentioned conditions or irritation, you should consult your doctor. You should always consult your doctor before using any nicotine products.