(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-)))
Smoking a cigarette is a lot like injecting pure nicotine.
( Smoking ( ( a cigarette ) ( ( is ( ( a lot ) ( like ( injecting ( pure nicotine ) ) ) ) ) . ) ) )
(ROOT (S (ADVP (RB Smoking)) (NP (DT a) (NN cigarette)) (VP (VBZ is) (NP (NP (DT a) (NN lot)) (PP (IN like) (S (VP (VBG injecting) (NP (JJ pure) (NN nicotine))))))) (. .)))