"Nice smokiness" refers to a pleasant and enjoyable taste or aroma that comes from foods or drinks being cooked or prepared with smoke. Full definition
Since there are so few ingredients, all of them really came through — a nice smokiness from the chipotle, a little tang from the tomatillos (and you can use tomatoes if you want; it will just be sweeter), and a slight punch from the garlic (but not too much, since it's pan roasted). (ellysaysopa.com)
The chipotle give a nice smokiness to the sauce. (simplyrecipes.com)
The slow simmer produces a complex flavor profile, with a nice smokiness from the bacon. (wendyweekendgourmet.com)