I just moved from a cigalike to a Go-Go, filled the Go-carts (cartos) Fri with the drip method and remembered my sis left 30-40 syringes at my house for her insulin injections, would be much easier for me with these, especially because I'll know the amount (the syringes are 1 CC, which I googled and found at is 1 ml, lol). I've never used these before, but thought you stuck the needle in the juice and were able to pull the top part up and the juice would fill up, but I couldn't get it to draw any juice (tried several ways). Are these type syringes (for insulin) not able to draw the thicker E-juice? If so, what kind do I need? Also, FYI-I'm not taking medical supplies from my sis that she needs, she now used pre filled syringes.