Well, let's see-- would your parents rather have you tripping out on hydrocodone for your back, or smokin weed for your back? If they have a brain between them, they'll choose the herb. Be careful, though--since weed is illegal, it has a bad reputation, especially to authority figures.

If they're worried about your health, get a vaporizer or eat it. At that point, they'd have to be complete slaves to propaganda to think that prescription opiates are a better idea.