I supplemented for several years. It was better than not supplementing.
When I decided to stop eating seed oils, and started supplementing with cod liver oil, I craved the cod liver oil like mad. Couldn't get to sleep without a dose. For about four months.
Now I eat fish regularly, avoid seed oils (omega-6 oils) like the plague, and have no desire whatsoever to eat the cod liver oil in my fridge.
I tried eating a bunch of typical seed oils for lunch a couple of weeks ago. It messed my brain up seriously for a day or so, and I still don't feel that I've gotten completely back to normal. The new normal, that is. I won't make that mistake again.
The only thing I crave now, occasionally, is salmon roe. Love that.
And listen to folks comment on how different my behavior is. For the better.
(That article is why I started supplementing with fish oil in the first place. I now believe that most, if not all, of our modern health problems involve malnutrition in one way or another.)