differs from simply "cruising" because cruising lasts at the most 4 or 5 hours while pot odysseys can last for much longer.
usually the length of the pot odyssey is undetermined at the start, because many pot odysseys are a mistake of toking too much.
when one is cruising, he/she is just getting munchies food or going to parties, but podysseys involve those as well as doing stupid retarded/random shit such as:::
-taking craps in neighbor's yards
-jumping into a lake
-driving into the woods to toke
-getting attacked by wild animals while in said woods
-getting into some form of trouble amongst people
-pathos or an emotional ending to the night
*if the definition is not entirely clear, many stoner films include podysseys, most famously "harold and kumar" or "pineapple express"
"dude i know! it was scary but hilarious"