There's no definitive answer to this question since it depends on the person's individual reaction to caffeine. Some people may find that they feel more energetic and alert after drinking iced coffee, while others may feel jittery or anxious. In general, though, it's safe to say that iced coffee can be addictive for some people. If you find yourself feeling like you need an iced coffee in order to get through the day, or if you find yourself craving iced coffee more often than not, it might be time to cut back on your intake.