I have a hair problem. Itz thinning at some parts on my head. My hair is thick in most of d places whereas itz thin n brittle at some I used hair gels in d past but stopped it a year back I am a smoker since 2-3 years n smoke 2 fags a day Im a student n I stay in a hostel where a few more guyz have similar problems who do not smoke or use gels n hair styling products. What can b the cause and remedy. Plzz help me.