I have had my mes 30 older generation for a few months now and one thing i have noticed is that my mes seems to produce a light amount of smoke while pre-heating without the amnps or other fuel source being used. I have my water pan foiled so im not sure if it is burn off from the foil, burn off from the walls, or some type of steam as i have only smoked thus far in colder outside temps. Does this occur with other mes users? Any thoughts? Thanks!