How do you counsel patients who want to use vaping to quit smoking cigarettes?

My patient population is largely persons with severe opioid use disorder. Most use tobacco/ nicotine in some form - typically cigarettes and/or vaping. I have seen people minimize their use of cigarettes with vaping and feel very happy with their results. I don't see, however, a lot of patients stop vaping and now have some patients who have been vaping chronically (years) and tell me that they feel addicted to vaping (craving, withdrawal, get in trouble for vaping at work and then start to try ...