Summer's eve

Okay so I just bought summers <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a> and I'm kinda scared to use it Because my mom has always said there bad for you but I really wanted it so I bought it with my friend. Can anything bad happen from using it? Like tss? (Plz don't be rude or judge me I'm 15 and I can't really talk about stuff like this)