It's not the morphine, it's the size of the cage: Rat Park experiment upturns conventional wisdom about addiction
The government (especially DARE) lied to us. Just like they did with cannabis. Does anyone remember the study that "proved" that cannabis kills brain cells? The one where they suffocated monkeys with smoke over and over again, then dissected their brains and pointed to the suffocation damage and said that cannabis kills brain cells, even though it actually heals the brain.
We really can't trust our government to study anything (CFIDS, cannabis, opioids, the majority of drugs approved by the FDA in the past decade).