Yes, it can mess with your breathing, back, neck, cause over heating, etc. It also will make your breasts flatten out considerably over the years. What can happen is what some will call "pancaking" Some may think, Oh YAY, they will be flat as pancakes. What I've seen is that they will flatten out and elongate a bit. So they will kind of look like an old ladies breasts. Again, flatten is what we want right? But if you're thinking you want top surgery down the line, the surgeon will have more skin to deal with because of the stretched and elongated boobs that long term binding produces. Depending on the surgeon, the more skin, perhaps more revisions down the line with dog ears, etc. Perhaps this wont happen to you, it just what I've seen in a few and what perhaps COULD happen.