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Mullein seems like it'd be good, but never tried it myself.
But seriously OP, just smoke some tobacco. It tastes great and with pipe smoking, you rarely inhale so the health risks aren't as significant as with other types of tobacco smoking (there's still the risk of oral cancer, of course). Just make it a special, once in awhile thing if you're worried about health risks. Or just smoke weed 420blazeitfaggot
