Medicinal cannabis may be helpful for muscle spasm in a variety of scenarios, most notably in Multiple Sclerosis. Without knowing any details about your vocal problem I’m not able to say much more than point out the lack of significant toxicity associated with cautious use of medicinal cannabis preparations. Perhaps you could start by reading this: https://www.hellomd.dev/health-wellness/cannabis-101-your-quick-guide-to-medical-marijuana
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