As some other reviewers have already wrote here, in comparison to the first movie this one does not have one contiunous main story so to say, rather a few (sometimes suddenly ending) side stories, BUT the main thing that makes these two movies enjoyable is not the main story or character development, it's the discussions they have about random stuff while combining it with some typical stoner humor. And the second movie has a lot of these hilarious discussions and situations, which makes it ( in my opinion) as good as the first one, but only if you have seen and enjoyed the first one.
I would not recommend watching this movie without having seen the first one, if you are unsure if you will like it.
I would not recommend watching this movie without having seen the first one, if you are unsure if you will like it.