Umair khalid

Hi!
Iam really new to vaping and know nothing. I bought a Smok v8 stick. The first time I tried it, it was good but the second time a used it , it started to create a burning sensation in my throat. I never filled my tank to the fullest and I usually just pour 5-6 drops. The liquids Vg and pg are 60VG/40PG. So please tell me how to reduce this sensation.
 
Thanks for your time.