If you vape them dry they do absolutely nothing. No Vapor. They do not burn like other coils. To test fired 20 seconds dry, nothing. Should never use a dry tank but this is good if you are not watching and happen to run out. Do other coils do this? My experience is terrible burnt cotton in your lungs. I am using temp control but that should not matter. Did not test if it burns in watts. Just an FYI. I know many do not use this tank anymore. I do because I need low Vapor output.