Is it permissible for a mother to get angry with her son if he smokes after she warned him against it?

We did not understand your intention with the question: Is her anger permissible? Smoking is forbidden (haram), and it has many harms. Giving it up and repenting from it are obligatory. The prohibition is further emphasized if the mother forbids it, for obedience to parents in what is good is obligatory. A mother's anger due to smoking is a praiseworthy anger because it is due to the violation of God's sanctities. You have disobeyed your mother's command, thus falling into filial disobedience, which is a grave sin. Therefore, you must repent from filial disobedience and smoking.