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Alfalfa might sound uncommon, but remember.... folks used corn cobs for smoking hams and bacon. Chicken thighs or drumsticks is probably the best meat to try this on.... it's inexpensive and takes smoke easily.
EDIT - I posted below, but you might try cheese too.
After thinking about this a few minutes, I did read an article about home brewers using hops pellets for smoking cheeses. You might be on to something....