Chewing gum
Chewing gum or bubble gum was a flavored Earth concoction, which Humans chewed but did not consume.

In the 20th century, a stick of bubble gum – a special variety, popular among children, in which the chewed gum could be blown into a bubble – was usually included with a pack of baseball cards - the 24th Century trader Kivas Fajo, whose massive collection of artifacts included a 1962 Roger Maris card, made sure that the scent of the gum originally packaged with it was preserved inside its display case. ()

In 1957, Johnnies Market in Carbon Creek had a chewing gum vending machine outside its door, offering two varieties. ()

An antique shop in San Francisco in 1986 contained a number of chewing gum vending machines. ()

Chewing gum was also a habit on Sigma Iotia II in 2268, where the planet's society was based on the 1920s gangster world of Earth. ()

In 2364, Beverly Crusher was offered chewing gum in a Dixon Hill holodeck program, but mistakenly swallowed it. ()

Guinan was chewing on chewing gum when she appeared as Gloria from Cleveland in the Dixon Hill holodeck program in 2367. ()

One of the lots sold in an auction held by Quark in 2373 was a mint condition 1951 Willie Mays rookie baseball card, but it did not come with the original packaging or chewing gum. ()

In 2375, during a game of baseball in the holosuite, Julian Bashir was confused by the notion of a food that one simply chews. Miles O'Brien gave Bashir a piece of his custom-made, replicated chewing gum that was infused with the flavor of Scotch whisky. ()

In 2377, Tom Paris and Ensign Tabor created a holodeck program of the Palace Theater complete with authentic chewing gum stuck to the floor. When she stepped on a piece, B'Elanna Torres opined that there was "such a thing as too much authenticity".
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External link 
 

de:Kaugummi
Earth
Victual culture
The Dixon Hill Series