Cannabis can be used for good in many ways, if you got the right mind set... I think it can help you solve a lot of problems, but as PharmaCan an others said: your dad NEEDS a strong will to overcome those problems.

I personally have never been an alcohol addict, but I must say that when I started smoking, I suddenly started thinking in alcohol like an absurd thing to do, I did started to drink a lot less, because for me, alcohol was now kinda pointless.