If you have an overly high tolerance to caffeine, and suspect you might be consuming too much, the best way to change your habit is to cut back slowly. First, you must start paying attention to exactly how much caffeine you are getting in a day, to know where your starting point is. But quitting cold turkey is likely to make you suffer serious and uncomfortable withdrawal symptoms like a headache, lack of focus, and general malaise.
Instead, try cutting back one cup of coffee or soda at a time, or even cut down by half amounts if a whole one seems like too much. Eventually, your body will adjust. And definitely, know what you are consuming. If you are struggling to give up your hot coffee or tea simply because of taste, or just the warmth it provides (physically and emotionally – hot beverages can truly be just comforting for the soul!), then luckily coffee and most teas can be decaffeinated. Caffeine can be hidden in certain products, especially some over the counter medicines. You might be getting in caffeine in ways you are not even aware of, so check the bottle and read labels.