Isn't it more problematic because the nicotine causes addiction, making tobacco users orders of magnitude more likely to develop cancer? Social media sites are designed to cause addiction, to keep people doom scrolling and looking for their next dopamine hit for as long as possible. But even if addiction isn't our main contention and we want to keep the comparison to ailments, social media is also responsible for mental illnesses like depression, anxiety, eating disorders, etc. in developing children.