this.
We discussed many scenarios in my addiction counseling classes and the consensus is that someone who comes home from work and has 2-3 drinks everyday but has no economic, professional, social, health or other problems for their use; still fulfills their major role obligations and doesn't give up activity for their drinking has less of a problem (or no problem at all) compared to someone who drinks once a week but blows all their money at the bar, drinks to the point of getting sick, makes bad decisions as a result such as sexual promiscuity that they are ashamed/embarrassed about, possibly injures themselves falling down or something and all week long thinks about finally getting to have that drink and has to forcefully resist the urge all the time.
It's not the amount or frequency that really defines someone's problem but the relationship they have with the drug and the consequences their use produces.
People can have a problem with a drug they only use once a week and there are people who blow every extra cent they have on heroin, oxy, etc. Only once a week and then all week long think about their next fix. Whether you want to call them an addict or not is a matter of definition but it's evident they have a problem.