Glorifies drug use as some fun, exciting, mind-opening experience when in reality it can cause permanent bodily harm and is not a substitute for therapy. The characters know this. The writers know this. The producers know this. The viewers know this. Everyone knows this, so why does this keep getting written into television shows? The answer is the writers couldn't think of any other excuse to film an irrelevant fantasy musical number with Shane as a sailor, which they wrongly assumed would be more entertaining than an actual well-written plot that takes place in the real world of the show.
This is a tired, cliché drug trip episode that is so over played out in television. It's a harmful trope that wasn't fun to watch the first 5000 times in 5000 other shows, and it's not any better in this one.