This is my experience, I am not offering any medical advice: A pure opiate will cause physical dependence. Your body will get used to the dose, then need a higher dose to achieve the same effects. I have never heard of kindling with opiates.
However, you are not at risk of death if you cold turkey an opiate, unlike benzos or alcohol. You will likely go through a painful withdrawal of 7 - 10 days (like a bad flu), and then, you are off the opiate. There is no prolonged withdrawal period after that like there is with benzos. You may feel miserable and might crave the drug or may need time for your body to start producing its own dopamine again, but those are mostly mild psychological symptoms.
I have kicked opiates more than once, I did taper down to a small amount first, then took a week off from work and did it. That's why this benzo withdrawal is so frustrating in comparison - the length of time is unbelievable.
There is also the issue of combining opiates with benzos, there is a high risk of overdose, definitely not recommended.