теперь он совсем не курит, так как

теперь он совсем не курит, так как у него плохое здоровье, а ведь раньше он курил сигарету за сигаретой.

Результаты (английский) 1:

now he does not smoke, because he has poor health, and in fact had he smoked one cigarette after another.

Результаты (английский) 2:

now he does not smoke at all, as he is in poor health, and after all, he used to smoke cigarette after cigarette.

Результаты (английский) 3:

Now he doesn't smoke at all, because he is not in good health. He used to smoke before.