i think the problem with Hangsen and Dekang is not the nicotine, but the fact that it is made in a place that is known for their cheapness in quality brings in to question the quality of the ingredients. Sure, they nicotine may be extracted naturally, Which would probably be the cheapest way to do it since they pay their emplyees like 25cents a day. But then, how pure is their Propeline glycerol. If a barrel of food grade is 100$ and a barrel of.... almost food grade is 80 $.... well..
And their flavors are mass produced... so there is that.
I didnt actually like the tobacco from them, only because it tasted like plant.