Currently using a CoolFire IV with a Nautilus Mini at 1.8 ohms. 8.5 watts. Planning to run the CoolFire IV until it bites the dust, then start to use the Provari 2.5 that I got on sale, and continue to use the Nautilus Mini. I am a tootle puffer, and proud of it. My daughter and I quit smoking, cold turkey, around 11 years ago. The desire to smoke never quit. Around 5 years ago, stress and anxiety about moving across the country was making smoking again seem more desirable. Enter vaping. No more cravings.