Dr. Sigmund Freud attempted to use cocaine to address withdrawal symptoms of which substance?

Dr. Sigmund Freud is historically noted for his early experiments with cocaine, believing it had therapeutic potential. In the context of withdrawal symptoms, he associated cocaine with the treatment of morphine addiction. Freud originally considered cocaine to be a miracle drug, proposing it could alleviate the withdrawal symptoms experienced by those who were dependent on morphine.

This understanding is significant because it highlights the early exploration of substance use and the potential role of other chemicals in mitigating withdrawal symptoms. Freud's initial enthusiasm for cocaine was later overshadowed by the understanding of its addictive properties and adverse effects. Thus, the correct answer regarding which substance he attempted to address with cocaine is indeed morphine, as that was the primary focus of his investigations into addiction and treatment during that era.