I think you should consult a doctor how to gradually wean yourself off the Oxycodone. I've heard this drug is highly addictive and my brother was addicted to it. In addition taking painkillers, even simple tylenol can lead to kidney failure if a person takes it everyday. Don't try to cut out smoking and the Oxycodone at the same time. Please do get help for this and it's best to go to an addiction center.