I have 3 mini 2.1 looking at the woods now, at the Jersey shore we get high HUMIDITY and the SALT !air/mist near the water affects wood more than regular conditions denser woods seem to hold up better. 2 of my mini's have been in regular use for almost 3years now and 1 still brand new tucked away for an emergency, never dropped never a problem (old faithfuls) knock on wood 18650 wood soon. Original empire, chi you, astro, provari mini all dust collectors now, I do use my provari to check new coils though. O REO got me off the sticks and now WOOD or RESIN??? Thank you very much for the wood chart very much appreciate!!!