I recently got the t-atty and tank carts. I'm really liking them, but earlier today, I was biting on the end of my tank cart (I used to chew my cigarettes, too), and the middle piece popped off hard enough that it went down my throat. It was kind of scary, so I went ahead and took the middle pieces off all my tanks. It seems to work fine without it, and I don't want a repeat! Just thought I'd warn any fellow "chewers."