Yes, this is the podcast: https://www.hubermanlab.com/episode/controlling-your-dopamine-for-motivation-focus-and-satisfaction

He doesn't talk specifically about Tea, but he mentions caffeine in general. Although I've listened to it again and it seems like caffeine may be an exception to the problems he talks about with stimulants :D. But in general, he says to think about spiking dopamine too regularly for no reason because it causes it to deplete afterwards.

Thanks for the book, I'll check it out.