> You're welcome to walk yourself down to Skid Row or your nearest homeless camp and conduct a detailed survey if you want the specifics.
What country is the subject of this discussion? I assumed the US because the article was about Oregon. Most homeless people in the US do not live in camps.[1]
> Or, a simple Google search will provide several studies including demographic details.
Simple searches found researchers couldn't agree how many homeless people used drugs. Never mind abused. Never mind abused before becoming homeless. Never mind became homeless because they abused drugs.
Simple searches found citations for the claim substance abused caused most homelessness failed to support the claim. A survey cited frequently asked mayors what they thought were the top causes of homelessness in their cities.
Simple searches found studies which said homelessness was economic primarily.
[1] https://aibm.org/research/homelessness-in-the-united-states/