I've been using this atomizer head for close to 2 months (56 days). On the MVS website, it's stated that it'll last 2-3 weeks. It's the second head I've had to put in the clearo I use, and it was swapped with the first due to my own mistake. It (the first one) just stopped working, it had been in for close to 3 weeks, so I put in a new one. I actually had just loosened it, and that's why it wasn't firing anymore. Do atomizer's like this just stop working, or do they slowly 'not work as good'? The tokes I get are perfectly satisfactory for me, besides I can't remember it's 'first tokeness power' anyway. I guess I could just swap out the second one and see if a new one is 'powerfuller', but I don't want to start using a third one if I don't really need to.