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)))))) (. .)))
The effects of injected cannabinoids might be different than smoking them.
( ( ( The effects ) ( of ( injected cannabinoids ) ) ) ( ( might ( be ( different ( than ( smoking them ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NNS effects)) (PP (IN of) (NP (JJ injected) (NNS cannabinoids)))) (VP (MD might) (VP (VB be) (ADJP (JJ different) (PP (IN than) (S (VP (VBG smoking) (NP (PRP them)))))))) (. .)))