How would you react good or bad?!?! 😵

Ok so for example we say that you have a daughter or a son he or she is only 15teen and smokes ... a lot he/she is stealing money for you and sometimes says  to you "mum i want to go out to eat can you give me money ?
and you say : Yes! and gives her/him money ... she/he does this all the time but he/she just lies ... he/she buys cigaretts for the money or "  asks people if they can buy him or her cigarett. 
Your best friend she told you this because her daughter told her and is worried about her and she dosent want to stop.
How would you react to your friend to telling this to you? would you be angry at her because its non of her business or  thank her to telling you this