Back in 2009 (or 2010 -- I can't remember exactly), I had purchased a couple of fog machines and used them for Halloween that year. After Halloween, I boxed them back up and haven't had an opportunity to use them again until this year. I set one up, filled it with juice, then plugged it in and turned it on. Within a few minutes, it was giving off a burning smell and putting out a fair amount of heat. Not wanting to set my deck ablaze, I unplugged it. Is this something I should be concerned about, or is it normal for a used fogger that's been sitting to act this way?