This was just my understanding from seeing my grand-father 40 years ago having to drop his pants to use insulin syringe + needle, to the use today where you can lift your shirt and use a insulin pen in a couple of seconds.
The infection risk is real. What's the relative risk increase regarding death with (with, not from) Hepatitis B infection (not diagnosis, infection) between people who've never injected themselves with anything and injection drug users?