A good datapoint, thanks. I'll have to read it thoroughly later.
(I'm not sure how important it is - if there is no transition to tobacco use, which was my principal concern from the start, is it really a problem? I know for a fact that I am addicted to caffeine and anyone who starts using caffeine will quite likely become addicted, but does that really bother anyone?)
Are you addicted, or just dependent? (Many drugs cause dependence without being addictive - anything that causes withdrawal symptoms causes dependence, and caffeine does cause withdrawal symptoms.)
If it's worth saying, but not worth its own post, even in Discussion, it goes here.