( ( ( Describe smoking ) ( as ( a ( learned behavior ) ) ) ) . )
(ROOT (S (VP (VB Describe) (NP (NN smoking)) (PP (IN as) (NP (DT a) (JJ learned) (NN behavior)))) (. .)))
Describe smoking as a learned behavior.
(ROOT (S (NP (JJ Learned) (NN behavior)) (VP (VP (VBZ occurs) (ADVP (RB only)) (PP (IN after) (NP (NN experience) (CC or) (NN practice)))) (CC and) (VP (VBZ describes) (NP (RBS most) (JJ human) (NNS behaviors)))) (. .)))