I am not a Reonaut, but smoked for 35 years. I had varied from 3 PAD 15 years ago, to 1.5 PAD for the last 5 years. I had been recently spending USD$ 200/month on smoking. eGo 510 to start (now last resort backup), Darwin (daily thing) and Boge Revolution 2.x (cheapie outdoor/working vape, and main backup). I am about 4 months in, and am still treading cautiously on small to moderate quantities of juice.
I have only blown up a few attys from n00bish errors, only toasted a few cartos. I found a 'happy tank'. I am in the black, and my monthly expendables are leveling off at about $30/month.
They are all basically batteries, heaters, and a method of delivering juice to said heater. Find one (or several!) that works for you. I feel/smell better, and didn't think I felt/smelt bad before.