Question: are all chili peppers hot?
Answer: An odorless, flavorless substance in peppers makes them hot. The culprit of the burning feeling you get from jalapeno-loaded Mexican food: chemical compounds called capsaicinoids. ... In 1912, chemist Wilbur Scoville developed a measure of the “hotness” of a chili pepper called the Scoville Organoleptic Test.