According to a clinician interviewed by the Australian Journal...

According to a clinician interviewed by the Australian Journal of Pharmacy, tackling the problem of addiction to codeine-based painkillers shall see them replaced by cannabis based products (once the Special Access Scheme Category B starts to kick in):

“There’s actually a lot of research suggesting that marijuana can be a really good gateway out of opioid dependency,” he adds. “It has some benefits for pain management and is a lot safer, magnitudes safer, than opioids.
“So it’s something that people could definitely transition to, but it’s an atypical pain reliever so not as accessible.”

https://ajp.com.au/news/booze-risk-pain-sufferers/