I'm new to this and have just purchased my first smoker. It will be delivered next week so I don't even have it yet. From my research, it looks like the lifespan of the one I purchased - Masterbuilt 30" 20070910 - is anywhere from one to three years. Is this accurate? How can I prolong its life? Could it be the manner in which these are stored? Where do you store yours? Is it ok to just put a cover on it and leave out in the elements? Lots of questions, I know. I'm trying to justify my investment.