Just wanted to add to Don's great info. I have found that statistically an atty has a lifetime approximately proportional to how long the user has been
vaping. Why? Because on average newer vapers, including me in the first few months of
vaping, can't seem to
leave attys alone!! They obsessively clean, probe, poke, rip up, soak, blow out, thinking that the atty will last longer, but attys are relatively fragile, and too much of the above is quite abusive and
will kill an atty by breaking the heating coil.
Virtually all of my attys are Joye 510 (2.2-2.6 ohm). I use 2 or 3 at a time, either on 3.7V mods or a 5V PT. When one is getting sluggish, generally just put it in a small container on my desk. When there are 5 or so attys in it, I then clean them. I rarely blow out an atty anymore, unless it gets so flooded that I cannot vape out the excess. Cleaning is hot water with polydent 12-hour tablets, and I let the attys sit in it overnight, rinse them thoroughly with warm water, dry them as much as possible with a paper towel, then let them sit for a day or so to dry. Then I dry burn them with short bursts to fully dry strong glow, and generally measure the resistance of each (higher ohms for the 5V, lower for the 3.7V).
My attys last several months. I have a couple I have been using for almost a year. I tend to drip mostly now, which I was always told would shorten atty life. This depends on the juice, it seems, with tobacco flavors tending to really bog attys down with high particulate content. So I generally use cartos for my tobacco flavored juices. Vaping hard on a cloggy atty will heat them up too much and permanently warp them. They are still working at the same resistance, but they often cannot be cleaned to unclog them, as the insides have heat-warped. Now when they get boggy they go into the to-clean container.
In my experience, less is more for attys, in addition to the above sensible watts/current parameters.