Yeah, the withdrawal's aren't as much a side effect from the dosages, as much as the frequency of use. You can become psychically dependent on a very small dosage of opiates if you take them everyday for a while.
Yes, at any dose really dependence can ensue, and addiction is often accompanying it. The wd's might be far less severe, as mentioned, however they will still be there to some extent if you discontinue a regimen of opiates.