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It's also worth mentioning that marinating meat before it's grilled, or even just coating it with some sort of liquid (soy sauce being an excellent choice) apparently cuts down enormously on carcinogens.
Thanks for these links. I've been using lump charwood for my weekly barbecues (even in winter; I've barbecued during blizzards in New England) every week for many years now, and I can't believe that I'd never found these sites!