Don't want to throw "water" on your smoker idea, I love the cedar fish thing too.

But, make sure your cedar shingles haven't been chemically treated with anti-fungals?

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I Googled it, and there are warnings about using the wrong kind for grilling/smoking.

I had a buddy who made the mistake of throwing old chunks of Pressure treated lumber on a fire, forgetting about doing so and roasting some hot dogs :'( He got sicker than a dog.