A closed system is pre-filled pods. I started a while back but I bought a few on the cheap for grab and go stealth vaping at the movies or whatever. Mostly if it's a pod I get open so I can change flavors and vape what I want.
Having said that, recently, I saw a Youtube video where a guy was saying we are creatures of habbit. People puffing on closed pods are stillgoing to the gas station like they used to, just getting a different product.
I can relate to that because when I first started, it was the little KR 808 e-cigarette. The one that was painted and sized to look just like a cigarette. Those would be good with nic salts. The habbit was totally different though because you cad to get your juice out and drip this little cartomizer making a mess in the front seat of your car where batteries and chargers and 10ml e-liquid bottles are everywhere.
I saved buckets of money so I did both for quite a while because of the quick light of a smoke. "Oh snap, my battery done died and I left my charger at home!". No matter if you vape on big rigs or even smoke tobacco, having a few disposables \, your get that quick light up. If yours dies and you pass a gas station, I would like my favorite flavor to be there.
I have about 100 setups of a different ilk. Now I just end up having about 5-10 batteries in different states of charge with a variety of drippers and tanks so I can switch flavors often. That is the best way to keep away flavor fatigue.
Anyway, mordinufsaid I guess