It’s often incorrectly thought tequila is produced from cacti juice. While agave plants have spiked leaves, they’re actually a succulent and come from the same family as asparagus.
Far from a Mexican tradition, the idea of a worm in tequila bottles was a marketing gimmick that dates back to the 1940s. While some mescals are sold with a worm, if you find any in tequila, send it back.
Like Champagne or Cognac, tequila is regulated under Appellation of Origin laws, meaning it can only be produced within a certain region. It must be produced and bottled inside the state of Jalisco, and other limited areas of Mexico.