What if part of the reason they got hooked on drugs was they were down on their luck 8-15 years ago, and she's only seeing the end result of chronic drug abuse?

What if part of the reason they got hooked on drugs was they were down on their luck 8-15 years ago, and she's only seeing the end result of chronic drug abuse? There's a high correlation between low SES and ice use. I know of three ice users in my broader circle and they're all very very poor but don't otherwise have mental health issues. Her impressions as a field doctor are useful but I am sceptical and this needs more rigorous study.