Often these mind/mood altering drugs can take advantage of even the most genuine mind states. I'd say most people using these drugs for an extended period of time fall victim to dependence/addiction, along with all the other inevitable effects that go along with altered physiological states that are chemically induced.
Even those who take them as prescribed often develop issues and its often the start of a downhill path despite the best intentions of the prescriber and patients following their care. To say someone won't have a problem, is something you can't guarantee.
The highlighted portions are simply and demonstrably false.
First, you can't lump (physical) dependence and addiction together. Dependence is purely physical and occurs when the body adapts to something and requires it for homeostatic functioning. This is observed with lots of medications such as antihypertensives (blood pressure meds) and nasal sprays that have zero abuse potential. You never hear people say someone is "addicted" to their heart medication but they ARE physically dependent.
Addiction is a biopsychosocial condition (I won't argue it is or isn't a disease here) that encompasses more than just the physical domain. Addiction is an unhealthy relationship with a substance (or substances) where the individual prioritizes that use over other aspects of their life and continues using despite consequences - whether legal, medical, social, familial, academic, etc. - that would lead most people to stopping or reducing their use.
Typically people who do not have a history of substance abuse who are prescribed opioids for legitimate concerns long-term do not become addicts but do become physically dependent because that is unavoidable. When chronic pain patients do happen to struggle with abuse and addiction, typically there is mental illness associated with having a chronic condition present. If people do not experience depression, anxiety, etc. from having chronic pain or find healthy ways to cope with those/address them or treat them, they will not abuse their medication or become addicted.
The stories of the June Cleaver-esque housewife or responsible, upstanding professional with no history of drug abuse who get hooked on pain medication and ruin their lives are compelling narratives so we have all heard them but they are not representative; they are the exception and not the rule but because you don't hear about the 95% of pain patients who take them as prescribed and DON'T become junkies, people tend to think the former is more common than it is.
My point in all of this, as I mentioned in an earlier post, is that exposure alone does not product addiction - addiction is more complex than simple physical dependence.
There is a slightly higher incidence of abuse and addiction rates in chronic pain patients due to confounding factors such as comorbid mental illness as a result of the chronic condition and so forth but to say that taking opioids long-term as prescribed when there isn't a history of substance abuse is "often the start of a downhill path" is simply inaccurate and as someone who has studied addiction formally for the past few years and experienced chronic pain even longer, something I certainly take issue with.
For the record, so it doesn't appear that I am just rationalizing, I used opioids as prescribed appropriately for several years and when I was still struggling, I tried to treat myself by adding poppy pods to supplement my prescriptions. I eventually found that they could be rather enjoyable, started abusing them (likely because of my inability to cope with having a painful chronic condition and the resultant anxiety and depression) and shortly realized that I needed to stop or I was going to fuck my life up and I did. I've since been managing chronic pain for 3 years now without regular use of opioids or other prescription medications. I have been connected-to and in contact with people from all walks of life dealing with chronic pain with or without addiction for years and this informs my views on top of my personal experiences and formal education on these subjects.
/rant