(CNN) Many people start their day with a cup of tea. But those who drink it piping hot could be increasing their risk of esophageal cancer, according to a new study.

Researchers found that tea drinkers who liked their beverage to be warmer than 60 degrees Celsius (140 degrees Fahrenheit) and consumed more than 700 ml of tea per day -- about two large cups -- had a 90% higher risk of esophageal cancer, when compared to those who drank less tea and at cooler temperatures.

The study looked at more than 50,000 people in Golestan, a province in northeastern Iran.

"Many people enjoy drinking tea, coffee, or other hot beverages. However, according to our report, drinking very hot tea can increase the risk of esophageal cancer, and it is therefore advisable to wait until hot beverages cool down before drinking," said Dr. Farhad Islami, of the American Cancer Society and the study's lead author.

Previous research has found a link between hot tea drinking and esophageal cancer. This study, published Wednesday in the International Journal of Cancer, was the first to pinpoint a specific temperature, according to the authors.

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