alcohol addiction can take years even decades to develop, that's correct
with gambling the dopamine hit is much faster so it can make people addicted easily, it's a harder drug
but mainly because it's fully psychological too, there's no biological substance directly involved with gambling as with drugs you consume.
I think that being addicted to alcohol or tobacco or other substances is noticeable since abusing them is not good for your health, smoking is ok, i smoke, but in moderation
same with drinking, if you drink a little you don't get stuck and you can enjoy this beautiful thing.
Gambling is infamous, you can't tell if you're addicted.