>>120504American Indians smoked all sorts of shit, maybe look there.
My grandfather told me that during the depression people smoked corn silk, and the old timers around here (TX Hill Country) used to smoke grapevine. I tried it once and didn't let it go out and wound up sucking a flame down my throat (was 6), never tried it again. Wild tobacco also grows wild in the States, but it's a LOT stronger than smoking tobacco