I'm actually wondering the same thing. I found that 4mg has the perfect throat hit, but there's no way for me to gauge how much nicotine I'm taking in, since I like to switch flavors and have taken to vaping way more than usual lately. I'm using a Vapor King auto battery from Vapor4life and prefilled cartridges. ELiquid is pretty much out of the question, due to my lack of sight, but I'd be willing to get sighted assistance if all it takes is adding a few drops of whatever to a cart. that way, if no one's around, I can still vape on it without the trick. Does using the usb passthrough or a manual battery make a difference? I've never used either one. Which flavors are good by themselves in 0mg? My guess is that something like Camel would be a good choice here, since it's very powerful. While I loved peach, I don't think it would be strong enough, since even in 4mg, it was pretty weak. I know that's true with Virginia, since I tried it in both strengths and liked the higher one more. I bought Parlament and FrenchPipe in 0mg, since I adored them in 4mg, and 555, a new one for me, in 0mg. So we'll see how it goes.