How to stop any form of addiction

It's multifaceted and different for every person. Much of it has to do with hurt.

If I could distill the answer into one simple point, I would say learn to love oneself and others, and take care of both.

But it's not always that easy.

there are support groups--AA, NA, ACOA and many more. Also, find a "safe" way to get the same pleasure--exercise, walk in nature, meditate, make love...play an instrument, listen to soothing music

First of all the person has to want to quit. Then they need to ask themselves why they're doing what they do. What do they get out of it?

Most addictions are pure self-destruction wrapped up in the powerful illusion of some pleasure or benefit.

The only relatively simple way out involves a lot of examination and reflection on what the person is actually doing, why they do it, and if their life would be better if they stopped.

If they are trying to stop
They have already admitted to themselves that they have an addiction
And thats 50% of the job done .
They need a support group and close supervision. The best way is still rehab

I think it boils down to will power.
You have to want to quit.
Then you gotta make yourself quit.
Depending on the substance and length of time doing it there may be a need for other medication to keep from dying.

Therapy maybe could help

One day at a time!

Addiction is demonic. Requires spiritual delivery. Ask me how I know.

By switching to another addiction

There's no generic answer really