I honestly dont know if nicotine strength matters too much, its more the hit, taste and the vaping experience. the more the vapour cloud and slight heat on the mouth (controlled with the voltage) the better. The taste compared to a real cig is far better with the flavours available and I'm liking cinnamon, aniseed and maple rum, all mixed at 70/30 and 11mg. Going to mix the next lot down a bit, say 6mg to see if I notice. Just my opinion after 5 weeks in.