From numerous threads on this site you will find that nicotine absorption from vaping is way different than from smoking. The current thinking is around 50%, but no studies prove this yet. However, that's very misleading too. The mechanism of action with vaping is also different, the uptake of smoking through the lungs hits the brain in about 5 seconds, and the mechanism of vaping is through the mouth and throat nasal passages and is about 30 seconds to the brain. Not only are we getting a lot less nicotine, but the nicotine we are getting is far less addictive, making changing strengths (downward) much easier. I've noticed this in my own vaping. Traveling weekly, trapped on planes, I have no where near the behavioral response to vaping as I had with smoking, making it far easier to go longer between vapes than I ever could have with analogs. There are leading authorities and studies that show that transdermal uptake is even slower, so slow, in fact, that studies show transdermal nicotine addiction is not even likely. In other words, if one uses the patch, they don't get hooked on nicotine. Anyway, there's some very interesting studies out there and I wouldn't be too worried about how much nicotine you're getting. There also is apparently no known case of nicotine poisoning from vaping, and, again, studies show it is not possible, given the uptake mechanism. My two cents.