| Woody Harrelson | ... | Narrator (voice) | |
| rest of cast listed alphabetically: | |||
| Harry J. Anslinger | ... | Himself (archive footage) | |
| George Bush | ... | Himself (archive footage) | |
| Cab Calloway | ... | Himself (archive footage) | |
| Jimmy Carter | ... | Himself (archive footage) | |
| Chevy Chase | ... | Himself (archive footage) | |
| Tommy Chong | ... | Anthony 'Man' Stoner (archive footage) | |
| Nancy Davis | ... | Herself (archive footage) | |
| Dwight D. Eisenhower | ... | Himself (archive footage) | |
| Gerald Ford | ... | Himself (archive footage) | |
| Jerry Garcia | ... | Himself (archive footage) | |
| Allen Ginsberg | ... | Himself (archive footage) | |
| John F. Kennedy | ... | Himself (archive footage) | |
| Gene Krupa | ... | Himself (archive footage) | |
| Fiorello LaGuardia | ... | Himself (archive footage) | |
| Timothy Leary | ... | Himself (archive footage) | |
| John Lennon | ... | Himself (archive footage) | |
| Cheech Marin | ... | Pedro De Pacas (archive footage) | |
| Gertrude Michael | ... | Herself (archive footage) | |
| Robert Mitchum | ... | Himself (archive footage) | |
| Richard Nixon | ... | Himself (archive footage) | |
| Yoko Ono | ... | Herself (archive footage) | |
| Eli Perell | ... | Additional Voices | |
| Josh Perell | ... | Additional Voices | |
| Ronald Reagan | ... | Himself (archive footage) | |
| Harry S. Robins | ... | (voice) | |
| John Sinclair | ... | Himself (archive footage) | |
| Douglass Smith | ... | (voice) | |
| Stephanie Zari | ... | (voice) | |
Directed by | |||
| Ron Mann | |||
Writing credits(in alphabetical order) | ||
| Solomon Vesta | writer | |
Produced by | |||
| Keith Clarkson | .... | executive producer | |
| Marc Glassman | .... | associate producer | |
| Sue Len Quon | .... | co-producer | |
| Ron Mann | .... | producer | |
Original Music by | |||
| Guido Luciani | |||
Cinematography by | |||
| Robert Fresco | |||
Film Editing by | |||
| Robert Kennedy | |||
Art Direction by | |||
| Paul Mavrides | |||
Sound Department | |||
| Keith Elliott | .... | sound re-recording mixer | |
| Mishann Lau | .... | dialogue editor | |
| Rosnick MacKinnon | .... | sound | |
| Andy Malcolm | .... | foley artist | |
| Tom Trafalski | .... | sound designer | |
Visual Effects by | |||
| David Biedny | .... | digital rendering | |
| Dave Salter | .... | animation cameraman | |
| Mark Tureski | .... | optical effects (uncredited) | |
Editorial Department | |||
| Steve Franko | .... | colorist | |
| Sue Len Quon | .... | assistant editor | |
Music Department | |||
| Bob Casale | .... | music producer: "Quit Playing Games with God" | |
| Robert Kennedy | .... | music editor | |
| Elliott Lefko | .... | music consultant | |
| Guido Luciani | .... | conductor | |
| Guido Luciani | .... | orchestrator | |
| Herwig Maurer | .... | composer: song "Dope Dreams" | |
| Mike Rosnick | .... | score producer | |
| Ted Rosnick | .... | score producer | |
Other crew | |||
| Craig Baines | .... | researcher | |
| Simon St. Laurent | .... | opticals: Film Opticals | |
| Maury Whyte | .... | graphics coordinator | |
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| Milk | Frost/Nixon | The Weather Underground | The Cockettes | SLC Punk! |
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| Full cast and crew | Company credits | External reviews |
| News articles | IMDb Documentary section | IMDb Canada section |
Woody Harrelson narrates on a very interesting and highly informative documentary on the history of US law and drug policy regarding the highly controversial substance cannabis. Highly entertaining and witty with a vast collection of clips and videotapes of politicians, musicians and pot parties. Yet again, the US government has egg on its face as the amount of money spent on the war on marijuana rises, along with the amount of people using it. Exposing some of the blatant ignoring of government reports and findings, Grass moves along a good pace and doesn't get too carried away at any point with statements of how great cannabis, mostly just the facts. However, there is a lot more to the plant that has obviously not been included, as the film focuses around the efforts made by the US government only, and not cannabis as a whole.
Definitely an interesting film, with lots to learn from it, but by no means the definitive word on cannabis.