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I am new to smoking but I would think unless you happen to be smoking anyway, or want to add a smoky flavor, it wouldn't be cost effective to dehydrate veggies in a smoker.
An warm oven works great. If your household oven doesn't go down to about 110 degrees F just stick a 60 - 100 watt ligh bulb in there or you can build a dehydrator box and use a fine sanitized screen to hold the items and the light bulb for the heat source.
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