Once I Had A Terrible Addiction To Pain Meds, Morphine,

Once I had a terrible addiction to pain meds, morphine, norco, percocet and Vicodin. I had to have a detox and after that I had never take pain meds again. Now that my Dr prescribe promethazine with codeine for my cough and kind of allergy issues. The effects made me sensible, can I relapsed or the effects are normal?