Congrats on being analog (cig) free for 9 days!
I have an eRoll on the way myself. Been
vaping on other stuff and want to try that for the form factor.
Yes, you can refill and reuse your carts. After filling and refilling over and over they will probably start fitting loose and start leaking, that's when you know it's time to change it. Not sure how frequently that happens on the eRoll.
Atomizers vary depending on what kind of
juice you are using. Many people will get months out of their attys before needing to clean or replace them, others will get just weeks. If you think performance of your eRoll is declining and the battery is full,
juice is the same...then it may be time to either clean or change the atomizer head. Cleaning the atomizer head following by dry burning and another rinse, then letting it dry, will often bring back performance for awhile.
There are threads here that are specific to the eRoll where you can see other users' experiences with theirs and that should help answer more of your questions.
Welcome to the forum!