This is very common phenomena I had seen throughout my years working with people in the addiction field. Caffeine and smoking is very difficuly to quit. I wrote a book about addiction that is published in Illumination book chapters that share more similar stories like this one about Tine. Please follow this link if interested https://gkorosi75.medium.com/list/addiction-and-more-uncovered-book-chapters-f4f16a0d638f