If you mean attractive in a physical sense, I wouldn’t know. If you mean as a personality/presence/vibe, I think smiling genuinely make people drawn to you and give you attention. I am a smiley person a d genuinely give all my attention to the other person in a conversation, and that makes me a „popular“ person that makes people seek my presence. But I also had a lot of people saying that seeing me from the outside, just passing by them, I look arrogant and they could not imagine I was instead a nice person. But I don’t usually walk on the street and smile and look at the others all the time. I am with my thoughts, so maybe too serious. So I think smiling is a great skill for attraction. And being confident and having genuine conversations.