My STLTH is making a cracking sound, should I be concerned? June 14, 2021 17:02 Updated Rest assured, it is normal and safe, and most definitely not a cause for concern. We use cotton coils and they sometimes make a cracking sound when in use. Related articles Is it normal for my STLTH pod to leak? How do I take a puff on my STLTH? What can I do if my STLTH battery is not charging? Where is STLTH made? What kind of battery is in my STLTH device?