However, an advance directive is not the same as a power of attorney, medical power of attorney, or durable power of attorney for health care. If you are interested in using a power of attorney, you should seek legal advice.
§ 26:2H-5: After a living will is created, the declarant may suspend the instruction directive form or proxy directive even if they do not have what is normally considered the required mental condition to enter into such an agreement. It may be suspended or revoked in any manner in which the patient is able to communicate.
In addition to a living will, it is important to create a New Jersey last will and testament to ensure that your wishes are honored.