If the atomizer stops working it will do just that *stop* working.
Does the atomizer get hot-> if yes then the coil is still good.
However this does not help your situation. What kind of atomizer is it, 901/801?
The 901s use a draw hole near the battery connection to pull outside air
through the atomizer, if this is blocked an any way, you will not get any airflow
through the atomizer (especially since the PD/PT are both sealed, meaning that no air is pulled through the battery end). I could possibly see a bit of coil "gunk" clogging up the intake hole, but this is very unlikely.
The best solution that i could offer is to "cola bath" your atty in the hopes that any gunk that *could* be clogging it is dissolved/washed away. Keep in mind any maintenance you do will be at your own risk, but seeing as you have a non-working atty anyway, whats the harm.