That’s not actually what you want to ask: Drug use is an additional risk factor for becoming homeless, which tells you that the people who are homeless are likely to be drug users - but that really just sorts out who is likely to become homeless, not how many people. If drug use caused homelessness then places with higher substance abuse rates would have higher homelessness rates. But they don’t! The rate of homelessness is driven most clearly by the difference between area income and area housing cost, and does not correlate well to any measures of drug use in the area.
A nice pair of contrasting data points here is WA and West Virginia. Drug usage and addiction, as well as mental health problems, in West Virginia far outstrips Washington - see https://www.kff.org/statedata/mental-health-and-substance-us... However homelessness in Washington is far, far worse than in West Virginia. West Virginia had almost the lowest rate of homelessness in the country.
A nice pair of contrasting data points here is WA and West Virginia. Drug usage and addiction, as well as mental health problems, in West Virginia far outstrips Washington - see https://www.kff.org/statedata/mental-health-and-substance-us... However homelessness in Washington is far, far worse than in West Virginia. West Virginia had almost the lowest rate of homelessness in the country.
https://mountainstatespotlight.org/2024/07/16/wv-new-data-ho...
https://247wallst.com/state/how-the-homelessness-problem-in-...