I believe it likely that all drugs have a net negative effect in the long run. If humans in general had a chemical imbalance so our brains did not function optimally, and caffeine would fix that so that we just functioned better overall, shouldn't evolution have taken care of that by now?
Messing with the signalling systems can be productive in the short run, and certain individuals have other needs, but it is unreasonable to assume it would be good for most people forever. I do drink coffee every day, because I like it, but I would never assume it makes me more alert or smarter in some way.
Messing with the signalling systems can be productive in the short run, and certain individuals have other needs, but it is unreasonable to assume it would be good for most people forever. I do drink coffee every day, because I like it, but I would never assume it makes me more alert or smarter in some way.