An interesting look if you haven't seen this before.
Some of the differences in style to me come off as perhaps self-imposed--like he's thinking more about what he took than doing an actual honest self portrait. For example the fluctuation in style between doing marijuana and marijuana resin--feelings-wise, there's really just not THAT much of a discrepancy. But some are pretty interesting nonetheless. Although the guy who did all those portraits on acid seems a lot more sincere.