yea I used to do that. Until I got my pins mixed up and stabbed myself with a severly infected 18. I used it more than once and cleaned it with alcohol every time (low on pins at the time). Ended up needing 2 surgeries with a hole the size of an apple that had to be cleaned daily with what felt like a pipe cleaner and had to heal from the inside out. Still cant inject on my left glute 3 years later. So be careful.