For the most part I do not crave opiates, but when strong emotions come up or I experience arguments with those that I care about or symptoms of PTSD stemming from domestic violence, sexual assault, serving prison time, I become triggered to want to use.  These triggers are not specific to opiates though, and when I get in these spaces it seems that being able to use any substance (stimulants or opiates) is desired so that I can step away from my current feelings and reality at that time.