I've often wondered about the actual effect of caffeine on blood pressure for an individual. This case is pretty extreme, but the literature repeatedly suggests

I've often wondered about the actual effect of caffeine on blood pressure for an individual. This case is pretty extreme, but the literature repeatedly suggests that if you consume caffeine regularly, the effect on blood pressure is pretty minimal — that the significant effects are found if you do not usually consume caffeine and then do so. This always seemed a little suspicious to me because there are obviously limits to this reasoning, like this case, and the effects probably vary from person to person. I'm tempted to wean myself off caffeine to see if there's a difference for me, but I'm not sure if it is worth the trouble based on the literature. Anecdotally reading through forums it seems some people have dramatic decreases in blood pressure from doing so, but others actually report increases. I'd be interested to see the distribution of individual effects across people in a rigorous large-N ABA type study, but I can see how that would be difficult to do.