As an addiction psychiatrist I know that substance use disorders can effect anyone, no matter their age, their job, their background. Everyone has a story that brought them to this point.
My job isn't to demonise drugs or alcohol or gambling or the people who use those. My job is to get to know people and help them effect the change they want to enact. Seeing people make small changes and then build and build on those so tomorrow or next week or next year is better is brilliant.