While all TAS episodes had some kind of moral lesson, S1 E10 was an outright criticism of substance use.
M’Ress and Scotty, unwittingly exposed, end up enamoured then incensed with one another. One is never sure how different that is from a Caitian’s usual romantic style.
Chapel comes off badly in this one. As Spock puts it “A few moments of love, paid for with several hours of hatred.” It’s all the more poignant given SNW’s deepening of their backstory.
Is Yesteryear the one with Spock's parents? A friend of mine sat me down and insisted I watch it and yeah it's excellent.