(Imagine the difference between smoking a cigarette and injecting pure nicotine directly into a vein.)
( -LRB- ( ( ( Imagine ( ( the difference ) ( between ( ( ( smoking ( a cigarette ) ) and ) ( ( ( injecting ( pure nicotine ) ) directly ) ( into ( a vein ) ) ) ) ) ) ) . ) -RRB- ) )
(ROOT (S (-LRB- -LRB-) (VP (VB Imagine) (NP (NP (DT the) (NN difference)) (PP (IN between) (S (VP (VP (VBG smoking) (NP (DT a) (NN cigarette))) (CC and) (VP (VBG injecting) (NP (JJ pure) (NN nicotine)) (ADVP (RB directly)) (PP (IN into) (NP (DT a) (NN vein))))))))) (. .) (-RRB- -RRB-)))
Picture injecting nicotine into a vein compared to smoking a cigarette.
( ( Picture injecting ) ( ( ( nicotine ( into ( a vein ) ) ) ( compared ( to ( smoking ( a cigarette ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Picture) (NNP injecting)) (VP (VBD nicotine) (PP (IN into) (NP (DT a) (NN vein))) (PP (VBN compared) (PP (TO to) (S (VP (VBG smoking) (NP (DT a) (NN cigarette))))))) (. .)))