Just noticed something. The same kind of atomizer (same brand and model) actually performs differently (using the same cartridge). I am using a pen-style Rn4072 and am rotating between 2 atomizers. One of them has a harder draw but produces more compact vapours while the other has an easier draw (feels like a little leak somewhere) and produces less smoke. Both are still working. Hopefully its not a sign of the atomizer going to die soon.