I agree, caffeine dependency is an addictive drug. I know people who get moody and shaky without their morning dose. Kind of sad really. Even with energy drinks high doses of caffeine will lead to health problems in the long run
I'm trying to avoid all leather products as well, but always find some sort of leather in shoes. the new synthetic lilke foamposite, hyperfuse and flywire technology is good avoiding all the leather bits. lebron 9s dont have any leather same for hyperfuse, but cant say for the adhesive.