Lung trainer maybe helps with stuttering?

Lung trainer maybe helps with stuttering? I don't know if I'm just imagining it. But when the weather is too warm and I can't breathe well, I speak much more badly and therefore stutter more. So I got a lung trainer. And I've been training with it since yesterday, every day 6 times 30 breaths. I feel like I'm breathing better and the stuttering has decreased a lot. I'll keep an eye on that for the next few days.