OP: it is hit or miss, but seeing as you are addicted to an opiate, codeine, already, you obviously have an addictive personality.. so if you have easy access to dope, chances of getting addicted to heroin are pretty high... be careful, that is not a place you should go to.. it took me to places I never imagined it would take me to as my addiction from oxy turned to an addiction to heroin, and shooting oxy once in a while with dilaudid, or shooting other pharm opioids as a whole, on occasion.. when I got to heroin, I sniffed the ECP and smoked the black tar heroin, then I was handed a brand new rig, filled with a perfect dose of some fire dope, and after that moment, snffing and smoking H, was history.. once I shot good dope, I became a total needle IV addict, and then shot everything...