Can drinking 45ml of spirit (40%) per day affect your health? Based on this question How much actual alcohol is safe to drink per day? we can see


  The National Institute on Alcohol Abuse and Alcoholism suggests no more than 4 drinks per day, and no more than 7 drinks per week, to stay at a low risk for an alcohol use.
  
  A single drink technically does vary but about 45ml / 1.5oz of spirit 


This makes me think it's not that bad that amount of alcohol.

Says no more than 7, then can be 7, which means one could end up drinking 315ml per week.

From experience,

Won't this affect your brain at all?

I've heard alcohol can kill your neurons.

Could you develop addiction to alcohol by drinking that amount?

Thanks in advance
To answer your last question first, drinking 1 drink a day will not make you dependent. Drinking 3 or 4 times that amount probably won't make you dependent physically. Physiologically, you might become dependent on drinking for the effects but with that little amount, it would be very tough to be physically dependent. It's more of a bad habit at that point. I have a family member that was/is an alcoholic and he was drinking a pint of vodka a day. Obviously he was physically dependent. 

As someone who was physically dependent on cigarettes a while back, I have never had anything approaching those nicotine cravings. Unless, you've been there you'll never know. But, I do have a habit of coming home from work, cracking a beer and eating dinner. It's relaxing and tastes good.

I know family members that have been drinking almost every day since they were 18 (now in their 80s) and sharp as a tack and others that never drank that can barely remember what day it is. The human body is widely different from one person to another. Some native Americans have a really hard time metabolizing alcohol, while northern Europeans have livers of steel. 

So, the answer to your question is that it depends. It depends on so many variables, you'll never get a straight answer. The best thing you can do is drink as little as possible and enjoy yourself. Don't binge drink and don't get into a habit.