Referring the question to Dr. Main  K. Al-Qudah, a Member of the Assembly of Muslim Jurists in America, he said,

Masturbation is not the right way to fulfill one’s lust and natural desires. It might cause serious health and medical side affects, especially when done regularly. Also, all that the respected Sheikh mentioned in his book you mentioned in your question is not supported with evidence.

We ask those who do masturbation to get married as soon as possible and to lower their gazes and to observe fasting as a way of seeking Allah’s protection. They should busy themselves with things that bring them closer to Allah.

May Allah guide you and us all to the right path.