Momo stop... when we apply logical reasoning to yaoi it all falls apart (〜￣△￣)〜
He is not refering to Dane's pheromones, since he still thinks he is an beta and can't detect them.
What he meant was pheromone accumulation in general. There is a reason why they have to release their pheromones regulary. Pheromone accumulation can lead to brain damage/ they can go insane. His DA dad got braindamage because of that, he lots the ability to feel emotions, and it would be worse if is wasn't for his partner Koi's ( Grayson DO dad) pheromones keep it a bay.
So Grayson is pondering if he gone insane because of pheromones.
I'm confused... Why would he think he's being influenced by phermones if he thinks he is a beta??