▁in ▁Florida ▁used ▁to ▁produce ▁ph osph ate ▁for ▁American ▁to b acco ▁cro ps ▁contains ▁u ran ium , ▁rad ium , ▁lead - 2 1 0 ▁and ▁pol on ium - 2 1 0 ▁and ▁rad on . ▁The ▁radio active ▁smoke ▁from ▁to b acco ▁fert il ized ▁this ▁way ▁is ▁depos ited ▁in ▁l ungs ▁and ▁releases ▁radiation ▁even ▁if ▁a ▁sm oker ▁qu its ▁the ▁habit . ▁The ▁combination ▁of ▁car cin ogen ic ▁tar ▁and ▁radiation ▁in ▁a ▁sensitive ▁organ ▁such ▁as ▁l ungs ▁increases ▁the ▁risk ▁of ▁cancer . ▁If ▁the ▁sm oker ▁also ▁breath es ▁in ▁the ▁as best os ▁fib ers ▁which ▁commonly ▁occur ▁in ▁urban ▁and ▁industrial ▁environments , ▁the ▁risk ▁of ▁cancer ▁is ▁greatly ▁increased . ▁ ▁See ▁also ▁Tob acco ▁ ▁References ▁ ▁Further ▁reading ▁E van ▁P . ▁Ben nett , ▁When ▁Tob acco ▁Was ▁King : ▁Famil ies , ▁Farm ▁Labor , ▁and ▁Federal ▁Policy ▁in ▁the ▁P ied mont . ▁G aines ville , ▁F L : ▁University ▁Press ▁of ▁Florida , ▁ 2 0 1 4 . ▁International ▁Labor ▁Office , ▁B itter ▁Har vest : ▁Child ▁Labour ▁in ▁Agricult ure . ▁Gene va , ▁ 1 9 9 7 . ▁International ▁Labor ▁Office , ▁Child ▁Labour , ▁Target ing ▁the ▁Int ol er able . ▁Gene va , ▁ 1 9 9 6 . ▁International ▁Labor ▁Office , ▁International ▁Haz ard ▁Dat as he ets ▁on ▁Occ up ations : ▁Field ▁C rop ▁Work er .