I have been using both a Nautilus Aspire and a Mini tank on an ileaf 20 watt.
12 watts is where I have been running it for the last two weeks. The shop owner that
I visit the most did not recommend running it higher than that. I have only been
vaping for three weeks today. My COPD damaged lungs could barely take 9 watts
when I started. After vaping for three weeks, I am breathing better than I have in
10 years.
For the cost of the ileaf 20 watt and an Aspire tank, I can't imagine why
anyone smoking daily would not try vaping. (just my opinion)