Neither is enough to sway most physicians IMO. This seems to me like trying to stir up a scandal where there really isn't one.
I did hear on the radio today that 90% of prescription opiates are sold in USA and Canada, with the bulk of that being the USA. Other countries treat pain more holistically.
Some people are given pain pills because their teeth are impacted and the doctors have to break bones; the surgery is far more painful in the recovery stage than if it goes normally.
Even still, a common theme amongst my friends who got vicodin after the surgery was them not taking the pills, or only taking a single dose the day after to manage the pain.
It is not just a bribe.
Companies spend a few dollars on advertisment per person to get more customers. When you can spend $2,600 on one doctor for advertisment purposes, you can do a lot to get their attention.