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"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.".
.samantha long..yet these drugs are not a "home run," says elizabeth loder, md, a professor of neurology at harvard medical school and chief of the division of headache at brigham & women's hospital..
https://drbryanpwalsh.com/Humprey-grandma-of-Polson-from-Sundby?Polovoyfa=126 
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