. . .it causes stroke and dementia as well as mood disturbance. svd increases with age but is accelerated by hypertension and diabetes. ."if the battery in a mechanical mod over-discharges and the device doesn't contain enough air holes to allow the battery to vent, there is a risk of explosion." . . http://lm360.us/Jansma-brother-of-Contreas-from-Yinquan?Gislerfat=113