I’ve heard this time and time again from people and it is usually in the context of somebody trying to downplay their unhealthy relationship with alcohol. Sometimes people will try to defend their drinking by saying they aren’t an alcoholic and they can stop any time they want.
If you get to the point where you have to ask this question about yourself or a loved one chances are there is a problem. Whoever the person is in question may or may not technically be an “alcoholic” but there is certainly an issue with substance abuse at hand that needs to be addressed. If it wasn’t a problem then there would be no need to even ask if there were one.