personally im not a smoker, but i had a running friend tat who smoke n drink alcohol pass 20+years. I meet him last year june or july, This the story he told me, slowly deduct for 1 pack to 2-3 aday n join sports(running). Cause running need alot of breath. he just reduce till 2-3 pcs a day in few month, before complete stop for good till today, he never smoke back..

quit it, stay away from smoking kaki and find something else to do