From what I understand they say not to go higher than 36mg of nicotine. I have used an eGo battery with low resistance cartomizers for a few months and I'm satisfied most of the time with 24mg nic. This after 37 years of tobacco. Now I have found with my new Variable Volt Mod. box that I can be more satisfied. He may have to try more powerful equipment (batteries, low resistance cart's, Mod) to satisfy his needs. I would recomend what I just got that kicks azz. Ovale V8 variable volt Mod from SmokTek.com Its only $50.00 for the whole kit. Hope this helps you.