It's all personal choice, personal tolerance, juice choice and setup.
Tootle puffing on my Nautilus Mini's at 7w, I never lung hit.
With 12mg nic in my Kayfun v4, airflow wide open, I'll mix it up between MTL and some gentle 4 second lung hits.
6mg, dual coil in my Derringer, running 0.7ohms...