Throat hit is like a peppery sensation.
Harshness is just that, harsh. It's more like a sandpaper sensation or a sore throat. Often with a burnt feel or taste.
Harshness can be caused by several things, overheating the eliquid, cheap ingredients, badly designed coils (again, related to overheating) where not all of the coil is within the airflow stream, If the coil is too wide so the middle is cooled but the sides overheat or has an ID that is too large so only the port facing side is cooled while the other side is in a air shadow.
Premade coils or attys with poor airflow stability or high turbulence.
High VG liquid will mask these problems somewhat because of VG's higher boiling point and tendency to have higher flavoring percentage per volume.
I'm glad you're the devils advocate. Always funny arguing with you. I think my stm premades have plenty airflow and have heard nothing but good things about the crown and tfv4 which I will eventually get my hands on. I disagree with the whole vg thing tho. I know when my juice is burning and too harsh. With proper wicking and airflow you can get decent flavor on higher vg juices. Yes sometimes you gotta add more flavoring but that's just how it goes. Like I said. I vape 50 50 right now. But I can see how people like higher vg. I'm starting to move away from throat hit. Even tho I used to like a lot. Now IDC about it much. But that's just a preference thing. No right or wrong thereThroat hit is like a peppery sensation.
Harshness is just that, harsh. It's more like a sandpaper sensation or a sore throat. Often with a burnt feel or taste.
Harshness can be caused by several things, overheating the eliquid, cheap ingredients, badly designed coils (again, related to overheating) where not all of the coil is within the airflow stream, If the coil is too wide so the middle is cooled but the sides overheat or has an ID that is too large so only the port facing side is cooled while the other side is in a air shadow.
Premade coils or attys with poor airflow stability or high turbulence.
High VG liquid will mask these problems somewhat because of VG's higher boiling point and tendency to have higher flavoring percentage per volume.