 Devin Mills is an addiction researcher at Texas Tech, and he says the latest research is putting shopping addiction in the same category as hoarding. People buy more than they need and never return it. Some red flags are when people take out new credit cards to fund their prime day shopping spree. Also, buying stuff you don't need just because it's on sale. He says that's when it's time to get help. Consumer and Business News, Erin Reyal, NBC Newsradio.