The National Council on Problem Gambling has reported that 85% of people in the US visited a casino and gambled in the past year, and that around 2% of people in the US have a gambling addiction, amounting to around 6 million people.

Source: https://www.thedenverchannel.com/news/national/estimated-2-of-americans-suffer-with-gambling-addiction-as-gripping-as-drugs-or-alcohol