( ( ( The harm ) ( occurs ( when ( ( these ( defense mechanisms ) ) ( ( do n't ) ( do ( the ( job ( and ( small ( ( particles and ) vapours ) ) ) ) ) ) ) ) ) ) ) ( ( ( enter ( the ( ( body and ) damage ) ) ) ( ( ( the ( respiratory system ) ) , ) ( brain ( of ( other organs ) ) ) ) ) . ) )
(ROOT (SINV (S (NP (DT The) (NN harm)) (VP (VBZ occurs) (SBAR (WHADVP (WRB when)) (S (NP (DT these) (NN defense) (NNS mechanisms)) (VP (VBP do) (RB n't) (VP (VB do) (NP (DT the) (NN job) (CC and) (JJ small) (NNS particles) (CC and) (NNS vapours)))))))) (VP (VBP enter) (NP (DT the) (NN body) (CC and) (NN damage))) (NP (NP (DT the) (JJ respiratory) (NN system)) (, ,) (NP (NP (NN brain)) (PP (IN of) (NP (JJ other) (NNS organs))))) (. .)))
The harm occurs when these defense mechanisms don't do the job and small particles and vapours enter the body and damage the respiratory system, brain of other organs.
(ROOT (S (NP (DT The) (NN brain)) (VP (VBZ is) (VP (VBN harmed) (SBAR (IN if) (S (NP (PRP you)) (VP (VBP get) (NP (NNS meningitis))))))) (. .)))