She said she liked the idea of what the bindi represented, like...
It's not like she randomly picked one because it "looked" pretty. She explained in an interview that she understood what they stood for. So as long as she's not blindly choosing them because of their looks, she's good in my book. DWUW Selena sis.
Why are y'all so upset? Smoking will likely only improve Selena's already impressive vocal range and ability, just like they did for other great singers like Katy Perry, Britney Spears, and Paris Hilton.