It reminds me of the continual stream of articles breathlessly proclaiming that some activity "rewires your brain!", like this is automatically some bad thing. But your brain is constantly rewiring itself; it's what it does. Your brain isn't rewiring itself because you played a ton of chess; it's rewiring itself constantly, and it's rewiring itself to play better chess if that's what you do. If you stop playing chess, it'll rewire itself to get worse at chess as it optimizes for other more local concerns.
Similarly, all sensory inputs release neurotransmitters. It's how you perceive things, so all perceptions release them, all the way from the bottom raw inputs up through the fully processed semantic content and emotional reactions. You can't say something is bad merely because it causes reactions; you need to do a lot more work and distinguish why some reactions are good and others are bad, which at the very least requires an operational definition of "good" and "bad".