Not allowing yourself something, especially alcoholic drinks, for moral, religious or health reasons. (Oxford)
Completely avoiding something such as alcohol or sex (Cambridge)
He has now been abstinent from alcohol for four years. (Cambridge)
He is totally abstinent at conferences because he wants to stay focused. (Cambridge)
abstinent from alcohol
abstinent at conference
Ascetic
Abstainer
Self-indulgence
Greed
Abstinence