I think cats know..... when I was a younger, I lived with 3 dudes, all of us tokers. We had a cat who would come running when he heard my housemate chop up in his metal bowl. He would follow the bong to who it was passed to, sit on your lap and stretch his neck in the direction we blew the smoke and make this weird ass purring noise. So one of the guys started blowing it on his face and he sat there and looked like he loved it, looking very content and purring. He'd follow the bong and when he'd had enough he'd go lay down in the corner for a nap. So we all started doing it and he seemed to love it. We tried to blow cigarette smoke in his face a couple of times to see what he'd do and both times he moved his head away and ran off. We changed his name from Ricky to Smokey. RIP Smokey the Cat
