Alcohol is a slow killer. Physical addiction takes about 10 years to form. First, it's barely noticeable. People think it's age, and "after 30 hangover lasts for 2 days". But that is not actually being hang over. It is the symptom of alcohol withdrawal. Mild one at first, but more severe as physical addiction settles in.

Drinking 3-4 days a week seems like "okay". However, it basically means drinking whenever withdrawal symptoms kick in. This is creating a feedback loop, that is very hard to notice, because it is mild, and also socially accepted.

If you really want to know how addicted you are, stop drinking completely for a week.

If you find yourself unable to sleep, or sweating all over the place, or having weird stomach or muscle pain, or have unexpected mood swings: you already have a physical addiction to alcohol.