Will the oath of poison be effective

This is superstition. Generally speaking, only under some special circumstances will a person take an oath if he wants to gain the trust of others and his own determination. As for the efficacy, it is absolutely impossible. Let's just say you have to think clearly. If you do this for a long time, there is no point in swearing. So I suggest you don't put your mind on any vows. It is the most important thing to face the reality in a down-to-earth manner, and only tangible achievements can convince people. Have a good time.