I inject meth/amphetamine a few times every other year and have been doing it for like what... a decade now almost? I've had some minor issues with addiction in the past, but nothing I can say that has ruined my physical or mental health to any major degree. I was just using a bit too much and realized it wasn't worth it so I stopped, since then I use it sporadically every now and then. But stimulants aren't really my type of drug, I'm guessing this is why I can get away with IV use so easily. Even if I get complusive doing it, it's not going to last more than a week before I eventually get sick of it and stop.
Addiction to drugs depends solely on the individual and not the drug itself. If I tried doing this with opiates I would fail miserably and be back to full time addiction in no time.