Watching porn is haram in Islam; it is a disease, not a remedy. The one who does that is afflicted and he should seek to remedy himself by repenting and giving it up, not by making up excuses for himself.

The fasting person is enjoined to fear Allah and to do what He has commanded, and to avoid what He has forbidden. Talking to the opposite gender does not break the fast but it takes away from the reward of fasting.

Yes, snus breaks the fast because when it is placed in the mouth it dissolves and some particles of it enter the stomach with the saliva.