BlackJack was a licorice flavoured chewing gum created by Thomas Adams of Staten Island, New York in 1871. Adams was attempting to create a rubber substitute by vulcanizing chicle, an experiment which ultimately failed. He went on to try boiling the chicle and made chewing gum. He added licorice to flavour the gum and began selling it at local stores.

BlackJack was the first flavoured chewing gum in the United States. BlackJack and other Adams gum products were the first to be sold by automatic vending machines.

Production of BlackJack gum was discontinued in the 1970's due to low sales.

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