“Any hot consumption of mate is associated with oral cancer[33] esophageal cancer, cancer of the larynx,[34] and squamous cell of the head and neck.[35][36] Studies show a correlation between temperature and likelihood of cancer, making it unclear how much a role mate itself plays as a carcinogen.[34]”
tekArtist 
Good advice.
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I don’t agree with the Yerba Mate one.
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“Any hot consumption of mate is associated with oral cancer[33] esophageal cancer, cancer of the larynx,[34] and squamous cell of the head and neck.[35][36] Studies show a correlation between temperature and likelihood of cancer, making it unclear how much a role mate itself plays as a carcinogen.[34]”
http://en.wikipedia.org/wiki/Yerba_mate#Cancer
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Ok, you won a battle but not the war!
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I’ve got no beef against YM. Besides the taste… ;)
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