Anyone else have an affect of tense muscles in the back when breathing in deeply? I don't know if it's this or something else, I don't know. I have had this going on for about 2 weeks now and not sure if it's from vaping or something I did. It was almost gone the other day but woke up today and I had the same type of pain. I've never had tense muscles or whatever exactly the feeling is but all of a sudden it's there and it kind of hurts my back. Maybe it's from the analogs over the years? Anyone with any idea what I'm talking about please give me an idea so I know what I'm talking about, haha.