A friend I have used to abuse hydrocodone, Oxycontin and Tramadol, in addition to other pills that were not opiates. This friend did this for a 2-3 years and developed a tolerance to these drugs. Since then this friend has stopped doing these drugs but has developed bronchitis with a pretty bad cough. My friend has been prescribed a codeine cough syrup that has not been effective even at 2-3x the recommended dosage. Could this be because of the previous opiate use?