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Reusing cooking oil causes cancer. I thought this was wildly known, but I'm consistently surprised at how many people online say things like this.
This is why "drip jars" stopped being used in the 20th century. There used to be one in every house until it was understood it causes stomach cancer.
https://www.adityabirlacapital.com/healthinsurance/active-together/2025/01/27/cooking-oil-and-cancer/
https://www.sfa.gov.sg/food-safety-tips/food-risk-concerns/risk-at-a-glance/reusing-cooking-oils
But singapore site links USDA q&a on how to reuse it safely and has section for "what you need to do if you reuse oil". They don't particularly advice or encourage single use.
Oil quality is dependent on storage method (strain it with filter, keep airtight non-transparent container etc) and cooking temperature so people need to be informed, but I don't see reusing it once or twice with appropriate care cause significant harm.
That's if you take it beyond the smoke point. Which you wouldn't do if you are trying to avoid free radicals in your food to begin with. Even vegetable oil is extracted through a heating process.