First, injected cannabinoids may not mirror the effects of smoked marijuana.
( First ( , ( ( injected cannabinoids ) ( ( ( may not ) ( mirror ( ( the effects ) ( of ( smoked marijuana ) ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB First)) (, ,) (NP (JJ injected) (NNS cannabinoids)) (VP (MD may) (RB not) (VP (VB mirror) (NP (NP (DT the) (NNS effects)) (PP (IN of) (NP (JJ smoked) (NN marijuana)))))) (. .)))
Smoking marijuana gets people higher than injected them with cannabinoids.
( ( Smoking marijuana ) ( ( gets ( people ( ( higher than ) ( ( injected them ) ( with cannabinoids ) ) ) ) ) . ) )
(ROOT (S (NP (NN Smoking) (NN marijuana)) (VP (VBZ gets) (SBAR (S (NP (NNS people)) (VP (ADVP (JJR higher) (IN than)) (VBD injected) (NP (PRP them)) (PP (IN with) (NP (NNS cannabinoids))))))) (. .)))