Caffeine is the most widely consumed psychoactive substance in the world. Even if you don’t drink coffee or tea, you still regularly consume caffeine, as it is present in everything from carbonated drinks and cold remedies to decaffeinated coffee and chocolate, reports ScienceAlert. What you need to know about caffeine Caffeine is quickly absorbed by the body, reaching its maximum effect within two hours of consumption, and it may take up to nine hours for it to leave the body. It is also water- and fat-soluble, entering all tissues of the body, explaining why caffeine can affect various organ…