( ( Your family ) ( ( can ( be ( ( exposed ( to ( this chemical ) ) ) ( ( ( if ( you ( use mothballs ) ) ) or ) ( if ( ( someone ( in ( your household ) ) ) ( smokes tobacco ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP$ Your) (NN family)) (VP (MD can) (VP (VB be) (VP (VBN exposed) (PP (TO to) (NP (DT this) (NN chemical))) (SBAR (SBAR (IN if) (S (NP (PRP you)) (VP (VBP use) (NP (NNS mothballs))))) (CC or) (SBAR (IN if) (S (NP (NP (NN someone)) (PP (IN in) (NP (PRP$ your) (NN household)))) (VP (VBZ smokes) (NP (NN tobacco))))))))) (. .)))
Your family can be exposed to this chemical if you use mothballs or if someone in your household smokes tobacco.
(ROOT (S (NP (NNS Naphthalens)) (VP (VBZ is) (NP (NP (DT a) (NN chemical)) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (ADVP (RB commonly)) (VP (VBN used) (PP (IN in) (NP (NNS mothballs))))))))) (. .)))