Swedish epidemiological study on gambling and health
Running from 2008 until 2021, the Swedish longitudinal gambling study (Swelogs) is the largest research program ever on problem gambling and health in Sweden. It is led and financed by the Swedish National Institute of Public Health.
The study shows that two percent of the population have gambling problems and four percent are at risk of developing gambling problems.
For a summary of findings to date see https://www.folkhalsomyndigheten.se/the-public-health-agency-of-sweden/living-conditions-and-lifestyle/andtg/gambling/swelogs/ There are also links there to detailed findings.