“How can one treat a laxative addiction?”

You are not "addicted" to laxatives. Your colon is slow, so you may be dependent on laxatives, but this did not happen because you used laxatives. The primary problem is a slow colon, which should be treated. You should have a full evaluation by a GI doctor to make a proper diagnosis and get you on appropriate medications to help.

Laxatives aren't considered to be truly addictive, however, it is common to develop a dependence on using them for chronic constipation. Your doctor may recommend non-laxative ways to address the bowel issues like walking, fiber and hydration and tapering off the laxatives.