If you’ve watched a sporting event lately – and especially if you’ve ever bet on one – odds are you already know how radically sports gambling has changed in recent years.

“It’s not even the same world,” said Dr. Timothy Fong, a professor of psychiatry at the University of California, Los Angeles.

Twenty years ago, if you wanted to legally bet on sports, you’d have to go to a casino in Las Vegas or Atlantic City, “and that’s about it,” said Fong, co-director of the UCLA Gambling Studies Program. Today, thanks to legal changes and mobile tech, “you never have to leave your couch.”

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