Okay, one of the reasons I was glad I quit smoking was so I would not continue to stain my teeth. I had started to see a bit of staining on my teeth from smoking and definitely did not want that to continue. Well a few days ago I noticed some brown staining on my teeth, way worse than I had developed from smoking. I have only been vaping for a few months. My favorite juice is a kind of darker brown color and I wondered if this is what is staining my teeth. I brushed my teeth thoroughly with peroxide and that helped get rid of most of it, but there is still a bit visible. Nothing I eat or drink has changed that would have caused this, the only thing that has changed in the past couple of months that I can think that might have caused it is vaping. I am going to continue to brush with peroxide a couple times a week to hopefully alleviate this staining but I am wondering if anyone else has encountered this.