There are other confounders associated with parties though, like drinking, staying up late, talking with people leading to innate comparisons with one's own lif

There are other confounders associated with parties though, like drinking, staying up late, talking with people leading to innate comparisons with one's own life, etc. all of which affect one's mood. I'm not entirely skeptical of the possibility of a cannabis effect, just saying not to be too hasty in generalizing.