I don't drink soft drinks generally, and certainly not in those quantities, but I vaguely recall feeling anxious after drinking cola before.
> Therefore something seems wrong about giving caffeine all the blame.
Possibly, but in this case, my primary comparison is between coffee and coffee with l-theanine and that one difference by itself produces a very noticeable difference in effect. I do not know what else in coffee could be producing jitters other than the caffeine. Or what in the cola could perhaps be inhibiting the effects of caffeine.
> Therefore something seems wrong about giving caffeine all the blame.
Possibly, but in this case, my primary comparison is between coffee and coffee with l-theanine and that one difference by itself produces a very noticeable difference in effect. I do not know what else in coffee could be producing jitters other than the caffeine. Or what in the cola could perhaps be inhibiting the effects of caffeine.