Also, as firefighters know, there can easily be smoke without fire. In the USA we have a bear seen on signs in National Forests. He was named Smokey". One line in the song about Smokey was that "he could find a fire before it starts to flame. That's why they call him Smokey. That is how he got his name."
Something like: "Don't ignore the little signs of trouble. Don't pretend you didn't notice them, don't pretend that there isn't something that caused those signs. Don't pretend there's no trouble."
Particularly applied to relationships.
Here's "Smoke without fire" by Duffy: