I'm one of those people who get hooked on stuff. It took many many years to kick cigarettes, and even now I vape on a low nicotine liquid. Since my hip was diagnosed in late 2012 I have had to use codeine for pain relief. On good days I could get by on 30mg a couple of times a day, but by the time my hip was replaced I was on 60mg up to 4 times a day, boosted each dose with a gramme of paracetamol. I had a glimpse of how much I depend on it when the hospital gave me morphine and OxyContin after my op, and they didn't touch the pain. Codeine worked though. I'm in no doubt that it will take a while to get off them when my hip has settled.
I love coffee. Good coffee. A Gaggia classic and an iberital grinder give me a geek's ritual to produce a double espresso every day. I very occasionally have another later, but knowing what I do about my addictive personality, I keep it strictly limited. I'll do six mugs of tea a day as well.