> not all diabetics use injectable insulin and the ones that do are more likely to do so at home.

I'd love to hear the citation for this one, as people using injectable insulin generally need to do in conjunction with eating, and I can't think of where you'd get the idea that T1 diabetics who use injectable insulin avoid eating outside the home as a general rule.

Granted, nowadays plenty of people are using insulin pumps which decimates disposable syringe use, but I'm really puzzled where you picked up that in-home/away-from-home impression from.