Just don't cut it with non-edible substances.
There are more potential issues. From perplexity.ai:
Methanol contamination: While the risk of methanol poisoning from properly made spirits is often overstated, bacterial contamination during fermentation can potentially increase methanol production to dangerous levels. Proper sanitation and fermentation practices are crucial.
Using toxic materials: Using improper materials like car radiators, which contain lead solder, can leach toxic metals into the distillate. Only food-grade materials should be used in still construction.
Improper cuts: Failing to properly discard the foreshots and heads of a distillation run can result in higher levels of toxic compounds in the final product.
Overproofing: Distilling to very high alcohol concentrations (above 95% ABV) can produce a product that is lethally potent if consumed undiluted.
Contamination: Poor sanitation or using contaminated ingredients can introduce harmful bacteria or other toxins into the final product.
Lack of quality control: Not properly measuring and controlling alcohol content can result in inconsistent and potentially dangerous products.