Dubiousity: doubtful
The major carcinogenic suspect of most soft drinks is benzene, which is a byproduct of the salts of benzoic acid (sodium benzoate, potassium benzoate, or calcium benzoate) combining with Vitamin C (ascorbic acid).
While citric acid does not contribute significantly to the production of benzene, evidences suggests that the presence of citric acid accelerates the process. Heating, such as exposure to sunlight, also creates benzene. Diet and sugar-free soft drinks are considered more at risk because sugar has been found to inhibit the formation of benzene.
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