Actually I'd argue you dont even understand the basics of addiction.

I found out Omega 3's are used to get people off opioid and alcohol addiction.

Why is this?

The DHA part of Omega 3's is one of the main raw "ingredients"/chemicals in the brain and it helps with learning (brain plasticity), but it takes time, in kids it takes a few months before improvements are seen and in adults it can be longer because their bodies are larger. Ironically if you have an out of control teen, dosing them up on omega3's should help rein them in, whilst putting them in good standing for a longer healthy lifespan because of what they do to oesteoclasts.

Omega 3's also down regulate oesteoclasts, these are cells that destroy the bone and release it into the blood stream. Why does that happen? Because the calcium amplifies the effect of the catcholamines (andrenaline/noraandrenaline/dopamine). You can find catcholamines in a coup of tea which probably explains the extreme nature of the British! Its ironic that in old age, we end up literally but mildly out of our faces on the chemicals that are illegal!

If you are an adult, take several grams of omega3's for about a week or two and then feel your aches and pains. Err towards the two weeks if you are older and/or have really partied in your younger years. It will make you feel old, but this is a classic example of no pain no gain because whilst your bones are dissolving into your bloodstream helping to mask the pain and stimulate you in ways reminiscent of cocaine, speed or plain old off the shelf sudafed, they are a step closer to repairing themselves. The other step is increasing oesteoblast activity, the bone building cells, which is a different conversation, but if you feel wired at night when you want to get some sleep vitamin K2-MK4 is an excellent sedative in 5/10/15 milligram amounts!

Omega 3's also increase the size of the neutrophils, these make up a large part of our immune system cells and are the first line of defence. They go after pathogens, like most bacteria, some viruses, alien pathogens like plastics from bottles, nylon from toothbrushes, polysterene from fast food outlets, polution from vehicles like brake dust and emissions and other crap in our body.

So omega3's help our body stay healthier for longer.

Its not the only chemical that helps, beta alanine is another chemical which can make people quit addictive substances but you'll feel nauseous on it. However considering inflammation is reduced on a calorie restricted diet because the immune system doesnt have to attack as much food, it breaks down into a variety of chemicals which stimulate glucagon that increase blood sugar so you feel satiated for longer, so its a cheap alternative to semaglutide the Hollywood weight loss injection chemical and some of the Sulfonamide chemicals which were invented by a Nazi scientist (prontosil) that helped Winston Churchill and Franklin Roosevelt Jr, which are sulfur based antibiotics. It also gets desposited rapidly into the olfactory bulb so your sense of smell comes back rapidly and it also helps people with hearing loss to work out the words and sounds more quickly reducing the number of times they have to ask a speaker to repeat themselves. But by being able to smell better which is another of those creeping aging losses, you get to smell how bad things are.

When thinking of where pathogens are likely to enter the body, it seems logical from an evolutionary perspective to have a chemical beta alanine making up the sensing and detecting of pathogens which can also become a sulfur based antibiotic! In fact is this what gave Gerhard Domagk the idea to investigate and develop them? We shall never know, but I do know one thing and this comes out when looking at historical medicine, the medicine that worked from the 1800's and early 1900's still hold their own in todays world especially with antibiotic resistance. Keep the pathgens at bay your live a longer less stressful life.

So how much are pathogens and poor diet contributing to addiction, considering the above? People consume chemicals to seek solace. So addiction like this needs to be treated as a health condition, and the medical experts need to up their game and be less schadenfreude about it.

Is the refusal of experts to recognise the above, a stealth form of exploitation to keep their high paychecks and "respected" position in society?

There are chemicals and pathogens (bacteria and virus) to make people do nearly any behaviour. Once this is recognised, most problems with society become a health care issue.