I know this probably sounds like a noob question but then again I am still a bit of a noob lol. When will I know when to change out my coil head on my T3S clearo? Will I start to get less flavor/ vapor production or what? Because I've had the same coil head on my T3S for close to a month now and haven't noticed much of a decrease in performance besides maybe a little less vapor production but that's it.