The movie "Up in Smoke" is indeed available on the Internet Archive, a digital library of software, films, music, and other creative works. You can find the movie on the Internet Archive's website, where it has been uploaded and made available for free viewing.
You're looking for information on the movie "Up in Smoke" by Cheech and Chong, which is available on the Internet Archive. Here's some text:
The movie follows the adventures of Cheech (Cheech Marin) and Chong (Tommy Chong) as they embark on a journey to Red Rocks Amphitheatre in Colorado to attend the famous "Hemp Fest" music festival. Along the way, they get into various misadventures, including run-ins with the police, a groupie who becomes their friend, and a van that they use to travel.