What Causes Bulge In Disc?

I HAVE A BULGE IN L5 DISK A ND IM HAVING WORK COP HEARING COMEUP THAY SAY ITS FROM SMOKEING BUT IT PUT HOW DO YOU SAY IT PUT PRASHER ON A NERVE THAT WENT DOWN MY LEG THAT PUT ME IN THE HOSPT I THINK IT WAS THE FORKLIFT THAT I DRIVE EVER DAY AND FROM THE BIGER FOKLIFT I DROVE ACROSE TOWE THE BOUNS UP AND DOWN WAS BAD.