I've seen an interview with Conor, where he says that it doesn't matter what the song's about, as long as it has meaning to you as an individual then it has accomplished its goal. I think that with songs like this, the lyrics are meant to be vague enough where someone could relate to it, even if they're not in the exact same situation. The song is obviously intended to be about drug addiction, but also a relationship, ("The love I sell you in the evening by the morning won't exist"), loneliness, ("I can be my own best friend"), or simply the loss of innocence, ("It was so simple by the moonlight, now it's so complicated") "Lua," meaning "Moon" in Portugese is simply an artistic choice, but represents that innocence being lost over the horizon. Whatever aspect of the song has the most meaning is what is the song is really "about," regardless of whether that's the artist's intentions.
I've seen an interview with Conor, where he says that it doesn't matter what the song's about, as long as it has meaning to you as an individual then it has accomplished its goal. I think that with songs like this, the lyrics are meant to be vague enough where someone could relate to it, even if they're not in the exact same situation. The song is obviously intended to be about drug addiction, but also a relationship, ("The love I sell you in the evening by the morning won't exist"), loneliness, ("I can be my own best friend"), or simply the loss of innocence, ("It was so simple by the moonlight, now it's so complicated") "Lua," meaning "Moon" in Portugese is simply an artistic choice, but represents that innocence being lost over the horizon. Whatever aspect of the song has the most meaning is what is the song is really "about," regardless of whether that's the artist's intentions.