Cummings continued to use a mixture provided by Jacobson, eventually becoming a patient of Jacobson's son Thomas, who was based in Los Angeles, and later injecting himself. The changes in Cummings's personality caused by the euphoria of the drug and subsequent depression damaged his career and led to an intervention by his friend, television host Art Linkletter. The intervention was not successful, and Cummings's drug abuse and subsequent career collapse were factors in his divorces from his third wife, Mary, and fourth wife, Gina Fong.