Hello, I'm wondering if there are any books out there on the subject of finding substitutes to drugs. Specifically, I'm looking for substitutes to caffeine. It doesn't have to be other substances either like yerba mate or probiotics, but lifestyle changes or changes in perspective as well. I figure that finding substitutes to drugs is such a common approach to overcoming substance abuse that there must be tons of research on it. <-- That's what I'm looking for. Can anyone help me out? Thank you so much.