Yes, and if you have the spirit and patience for it, reaching out is absolutely the right thing to do.
Addiction does not pause because someone is incarcerated. If anything, the stress, isolation, and idleness of prison life can make the underlying pull of substances harder to resist, not easier. People struggling with addiction inside need exactly what they need on the outside: connection, accountability, and the knowledge that someone who cares about them is paying attention.
A letter is where it starts. You do not need to have the perfect words or a recovery plan mapped out. What matters is showing up. Letting someone know you see them, that you remember who they are beneath the addiction, and that you believe in the possibility of something different is more powerful than most people realize. Shame and isolation feed addiction. Connection and genuine care work against it.
The patience piece is real and worth taking seriously before you commit. Recovery is not linear and the people you are trying to help may not always respond the way you hope. There will be setbacks. The question is whether you can stay consistent through those moments without making your support conditional on perfect behavior. That kind of steady presence is what actually makes a difference over time.
If they have access to AA, NA, or any substance abuse programming inside, encouraging them to engage with it through your letters reinforces what those programs are trying to build. You become part of the support structure that makes recovery possible.
Reach out. It costs very little and it could mean everything to someone who needs to know they have not been forgotten.