"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.".

it's not clear how well they'll stack up against current migraine therapies, because head-to-head studies haven't been done...

the report was compiled by outside researchers who went into the fda�s own database of �serious adverse [medical-drug] events.�.