My father was sick for 5 months and in ICU all the time. During that time my mother quit smoking after smoking for nearly 45 years if not longer. She just put it down and it's been three months now and no cigarette. Everyone smokes around her but it doesn't affect her. Even after my dad died on 26 December she is still going strong even though she is totally devastated. If she could do it then you can do it too. Just put it down and don't replace the habit with something else.