I don't know, but for me this movie felt like an R-rated afterschool special. Denzel was very good in the role, and that plane sequence was very harrowing... but I don't think it breaks fresh ground in terms of drug addicts trying to break the habit. Zemeckis' direction is solid and supporting performances are good (save for Goodman's character, WTF?), but I think this pic is a tad overrated. Song usage was too on-the-nose at times as well.
Maybe if Zemeckis took some inspiration from Requiem from a Dream, it'd feel less preachy. Zemeckis and Gatins should've taken more critical risks instead of a softer, 'safe' ending.