The Gambling Addiction Recovery, Investment, and Treatment Act establishes a federal program to combat gambling addiction. It authorizes the Assistant Secretary for Mental Health and Substance Use to award formula grants to states, with allocation based on existing substance abuse block grant ratios, to support programs addressing gambling addiction. Additionally, the bill permits the Director of the National Institute on Drug Abuse to award grants for research specifically focused on gambling addiction. Funding for these initiatives is authorized for fiscal years 2025 through 2034, derived from a percentage of federal wagering taxes. The Secretary of Health and Human Services is also mandated to report to Congress on the effectiveness of these programs within three years of enactment.