Will quitting drinking and smoking make my hair better ?

Maybe: But more importantly, it makes a lot of other things better -- your cardiovascular health, your lungs, and your cancer risk goes down.

It may: Smoking does nothing but harm to your body. The chemicals in the smoke enter your blood and can cause vasoconstriction decreasing blood flow to skin, scalp, heart! more importantly, carbon monoxide kills people -- thats why they have those detectors in peoples houses. With every draw you take in a lil carbon monoxide. This binds your rbcs and blocks oxygen. Hair cells need oxygen to grow!