how much do you breath damn like a hyperventilating pufferfish >.< I prefer to indicate dialogue breaths with ellipses, as any pause. Sometimes a pause is shorter, more mechanical, and I'll use a comma, but imo it can be more confusing for readers."I see... roses." vs. "I see, roses." No.1 looks like statement of sight while No.2 seems like a response to another's statement.
Dialogue context plays a part, but in sentences like "I went there, and never came back." it's clearer that the comma acts as a slight pause. An ellipse might be over-dramatic here while a lack of anything indicates no pauses taken, so to indicate a breath being taken I'll say the comma is more effective here.