Grass (1999) is a Documentary film that follows marijuana is the most controversial drug of the 20th Century. Smoked by generations to little discernible ill effect, it continues to be reviled by many governments on Earth. In this Genie Award-winning documentary veteran Canadian director Ron Mann and narrator Woody Harrelson mix humour and historical footage together to recount how the United States has demonized a relatively harmless drug. Currently, you can watch Grass on Amazon Video, Apple TV Store. Streaming availability may vary by country and platform over time. It has a user rating of 6.6 out of 10 from 37 votes. Fans of documentary movies may also want to explore similar titles below.