Is saying "By God" to cut off the path of returning to smoking shisha considered an oath that necessitates three days of fasting if it is smoked?

Smoking cigarettes and shisha is forbidden due to the harm and impurity they contain. One must remain steadfast in abandoning shisha and not return to it, for sins create a black spot in the heart until it becomes entirely dark. Whoever persists in disobedience may die upon it. Shisha harms the body and money. If its cost were spent on the poor, it would be better. If saying "yes" is an answer to "Say, by God," it is not considered a binding oath. The believer abandons sins seeking God's pleasure.