There are plenty of variables that could be influencing your throat to become sore, so it is going to be hard to narrow done the cause(s). Here are some that plenty of other responders have chimed in:
- Airflow/Inhale draw
- Time spent vaping on the RH
- Hydration
- Wattage
- Nicotine
- PG/VG ratios
I would suggest playing around with these and fine-tuning it until you find a balance. Time consuming, but the safest route.
Another possible reason for complication is
heat. This is directly related to wattage, but heat really does a lot to your respiratory system and can be very irritative to the upper respiratory tract - damaging if it is very severe heat. It could be heat irritation or dehydration from hot air.
One solution that I see people advising is
increasing the airflow and lowering the wattage. This allows you to take in more air that is cooler and more humidified as compared to warm vapor. Ironically, even though vaping is essentially humidified air, you are not necessarily taking in the water that is in the air enough when you vape at too high a wattage/temperature.
Good luck finding a solution and let us know what worked for you.