Why Is My Disposable Vape Hissing After I Hit It? Just a heads up my vape started hissing, venting vapour and the mouthpiece got extremely hot for a few minutes. I wasn't using it at the time thankfully, but it did cause Why Is My Disposable Vape Hissing After I Hit It? Just a heads up my vape started hissing, venting vapour and the mouthpiece got extremely hot for a few minutes. I wasn't using it at the time thankfully, but it did cause Why Does My Vape Keep Hitting After I Stop: Understand Why Is My Vape Hissing? Common Causes & Solutions Explained