If you provide more details like the movie title or the singer/ composer of "Laya Kavithai," I might be able to give you a more direct answer or link to where you can find the lyrics.
Tholaindhu ponadhu ellaam – thodarvadhu illai endru Kodiyile poovadikkum – kootrukkum illai vendru laya kavithai lyrics
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A song about love and addiction (not to substances, but to a person). If you provide more details like the movie