Access to sports betting in the US has exploded since 2018 – and we're just starting to learn about the effects

For most of U.S. history, sports betting was rare.

Some people certainly bet on sports illegally via a bookie, or placed bets in the few places where it was legal, such as Nevada.

However, gambling policy took a sharp turn in 2018, when the Supreme Court decided that each state in the U.S. had the right to legalize or prohibit sports wagering as they saw fit.

The effects of this ruling were swift, with many states introducing legislation to legalize sports betting within months. Four years later, more than 30 states have legalized sports betting, and many more are working to legalize it in the immediate future.

This wave of legalized sports betting has opened the floodgates for new gambling opportunities. Not surprisingly, many Americans have expressed concern that the burgeoning access to sports wagering will create an influx of people with new gambling problems.

We’re clinical psychologists and professors who research behavioral addictions such as compulsive sexual behavior disorder and gambling disorder. Recently, we’ve begun a new line of research into sports wagering in the U.S. Our initial findings highlight how many Americans are gambling on sports, as well as the demographic most likely to do so.

The many forms of sports betting

Before talking about that study, it’s important to clarify what we mean when we talk about sports betting. Like most other types of gambling, it can take many different forms. Traditional sports betting refers to betting on the outcomes of sporting events. These bets could be placed on who wins a game, how many points the game was decided by, or the game’s total combined score.

Beyond the traditional form, sports betting can also involve betting on esports, which is professional, competitive video game play. It may also involve paid fantasy league play, which refers to people “drafting” virtual teams of players and competing against other participants’ virtual teams over the course of a sports season.

Finally, sports betting may also involve participating in daily fantasy league play. This form of betting is similar to regular fantasy leagues, but players select new teams weekly and compete week to week, rather than throughout a whole season.

Young men at risk

In early 2022, we embarked upon a long-term research project to study who is gambling on sports in the U.S. and how their gambling behaviors change over time.

We worked with the polling and data analytics firm YouGov America to recruit a nationally representative sample of over 2,800 American adults. We also collected another representative sample of over 1,500 American adults who had recently bet on sports.

We surveyed these two samples, asking them about their sports betting behaviors and a range of other mental health concerns. We also asked about symptoms of gambling disorder, which is an addictive disorder characterized by excessive or out-of-control gambling behavior.

We have just published our first round of findings from the early stages of this work.

In this initial paper, we tried to identify who was most likely to gamble on sports and how sports gambling related to problem gambling. Importantly, we did not just ask these people if they had “bet on sports.” We also asked about participating in fantasy sports, daily fantasy sports leagues and betting on esports.

In our nationally representative sample, we found that only a fraction of Americans have bet on sports recently. Although 17.2% of Americans reported having bet on sports in their lifetime, only 6.2% reported that they had done so in the past year. Similarly, only 5.9% reported participating in a paid fantasy sports league over the past year, only 4.2% reported being involved in daily fantasy sports leagues and only 4.1% reported betting on esports in the past year.

In short, sports betting is still a relatively rare activity in the U.S., and our data does not necessarily show increases from prevalence rates 20 years ago.

But we also looked at who was most likely to bet on sports. Across all forms of sports betting, we found that younger men with college degrees and higher incomes were more likely to bet on sports than other Americans.