Caffeine (energy drinks, coffee, tea), Pornography, Social media,... But one has to look for the deeper reason for suffering, not just these symptoms. Many of these things tend to be related to something bigger, related to craving and aversion. One learns this from meditation, through silent observing of thought-behaviour, mind-matter patterns. So it is not that these things are inherently bad, as one can consume these things in a very thoughtful, limited, conscious manner, like once a month or year or whatever. But they are often related to emotions that one seeks to have or not have, such as getting rid of loneliness, wanting to feel energised, wanting to feel important, joyful, and so on. But only through silence can one see this.