( ( ( Tobacco carcinogens ) ( -LRB- ( ( the ( cancer ( causing ( chemicals ( found ( in ( cigarette smoke ) ) ) ) ) ) ) -RRB- ) ) ) ( ( ( ( ( ( ( ( are deposited ) , ) presumably ) ( from ( the bloodstream ) ) ) , ) directly ) ( on ( ( the cervix ) ( of smokers ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Tobacco) (NNP carcinogens)) (PRN (-LRB- -LRB-) (NP (DT the) (NN cancer) (S (VP (VBG causing) (NP (NP (NNS chemicals)) (VP (VBN found) (PP (IN in) (NP (NN cigarette) (NN smoke)))))))) (-RRB- -RRB-))) (VP (VBP are) (ADJP (JJ deposited)) (, ,) (ADVP (RB presumably)) (PP (IN from) (NP (DT the) (NN bloodstream))) (, ,) (ADVP (RB directly)) (PP (IN on) (NP (NP (DT the) (NN cervix)) (PP (IN of) (NP (NNS smokers)))))) (. .)))
Tobacco carcinogens (the cancer causing chemicals found in cigarette smoke) are deposited, presumably from the bloodstream, directly on the cervix of smokers.
(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))))))))))) (. .)))