Someone forwarded me this article by Superfoodly, Is Liquid Smoke Flavor Safe or Cancer in a Bottle? This article seems to have useful health information. I will unpack the physical basis for this below, but the key takeaway is: smoked foods (i.e., have been exposed to actual smoke) like smoked turkey, and especially fatty meat/fish like salmon, have appreciably more carcinogens than food flavored by “liquid smoke” type flavorings.
Economist Writing Every Day 