For the first time ever, the Surgeon General of the United States has published a report on addiction and recovery. This is exciting because it puts lots of up-to-date information in one place. The report is long, but includes a brief executive summary that you can start with. There are also infographics that help others understand how big the addiction problem is and what each of us, in our own roles, can do to help.
Check it out https://addiction.surgeongeneral.gov