( ( ( Cigarette smoke ) contains ) ( ( ( ( may ( ( ( carcinogens -LRB- ) ( cancer-causing chemicals ) ) -RRB- ) ) and ) ( is ( ( one ( of ( ( the ( major causes ) ) ( of ( ( illness and ) death ) ) ) ) ) ( in ( the world ) ) ) ) ) . ) )
(ROOT (S (NP (NP (JJ Cigarette) (NN smoke)) (VP (VBZ contains))) (VP (VP (MD may) (VP (VB carcinogens) (-LRB- -LRB-) (NP (JJ cancer-causing) (NNS chemicals)) (-RRB- -RRB-))) (CC and) (VP (VBZ is) (NP (NP (CD one)) (PP (IN of) (NP (NP (DT the) (JJ major) (NNS causes)) (PP (IN of) (NP (NN illness) (CC and) (NN death))))) (PP (IN in) (NP (DT the) (NN world)))))) (. .)))
Cigarette smoke contains may carcinogens (cancer-causing chemicals) and is one of the major causes of illness and death in the world.
(ROOT (S (NP (NNS Cigarettes)) (VP (VBP are) (NP (NP (DT a) (JJ major) (NN source)) (PP (IN of) (NP (NP (NNS carcinogens)) (, ,) (NP (NP (DT a) (NN kind)) (PP (IN of) (NP (NP (NN chemical) (NNS substances)) (VP (VBN linked) (PP (IN with) (NP (NN cancer))))))))))) (. .)))