MY VID - need help and tips pls

[beginers09]

this is really weird i tried hitting my chin and it hurts, i remember back when i was in H.S. i got hit on the mouth and chin many times in fist fights and it never hurt like this also i remember i tried hitting my chin before with full force when i got mad and it never hurt im mean my face did hurt but not my brain. That was way back when i was in highschool and playing basketball in our shcool.

Now in college ive been inactive and smoking heavily for 2years now i think proabably its the nicotine in my brain this may be the reason because when i started training even just skipping the rope hurts my head but after days since i quit it seems to go away. But this chin thing really bothers me i will give this 3 months if it still hurts maybe i should just find some other sport. I also drink lots of coffee along with smoking cigs do u think these are factos why my brain became sensitive?