Evening vapornauts.... may seem a silly question. ... Kangertech sub mini.. OCC coil 0.5 15w-60w.. I have had this coil now for 2 weeks and still going strong with no reduction in performance I vape at 25/30W about a tank and a half a day... is this normal with some coils to last this long.. and as the coil gets older is it slowly deteriorating and would it be best to just change it to be on the safe side.. or shall I just wait for it to give in...