Hot mate isn't mate.I did find some government reports on it. I was not aware of this before…
Maté consumption and the risk of squamous cell esophageal cancer in uruguay - PubMed
A retrospective hospital-based case-control study was carried out at the Oncology Institute of Montevideo, Uruguay, to investigate the role of maté consumption in esophageal cancer risk. The study included 344 cases with squamous cell carcinoma of the esophagus and 469 controls recruited between...pubmed.ncbi.nlm.nih.gov
Cancer and yerba mate consumption: a review of possible associations - PubMed
The role of hot mate in increasing the risk of cancer of esophagus, larynx, and oral cavity seems to be supported by several epidemiological studies. The temperature could act by damaging the mucosa or accelerating metabolic reactions, including those with carcinogenic substances in tobacco and...pubmed.ncbi.nlm.nih.gov
P.S. As for tea and smoking, I only occasionally drink Tulsi Tea.
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I stay away from tea, other than this for now, since tea is acidic. For those sensitive, tea can irritate the mouth and tongue when pipe smoking.
but it is understandable that there are people who drink it like that.
But it's the same with any drink.