I'm a mental health professional and addiction specialist who works with people with substance use disorders on a daily basis. It is well established by science that addiction fits into a disease framework, as it causes observable changes to several parts of the brain (e.g the prefrontal cortex and mesodopamine limbic system) that impacts judgment, impulse control and basic survival drives. If you care to do a little research, this is one resource I provide to my patients to help educate, and I have plenty others (just ask)
https://www.recoveryanswers.org/recovery-101/brain-in-recovery/