I had a friend that use to inject those and thats all she did and when she quit she went through he11 and took her about week day 3 n 4 well awful from what she told me. I am not trying to scare you just being real. I wish you the best AND keep posting.
Injecting does not necessarily mean that the withdrawal will be any less difficult. If the half life is less time, then that only means that you will go into withdrawal sooner. Yes, it is possible that the drug will be out of your system quicker, but you would still go through the same withdrawal, if not worse from injecting. Do you want to quit - if so, this is the right place to be.