There are apps that keep track of how many cigarettes you haven't smoked, give you a breakdown of the milestones of recovery from smoking and help you visualize how long you are into each one, from 24 hours to 15 years, it might be the reassurance you need.
Yes after one month the lung will start to repair itself. But there are also multiple benefits from quitting smoking. As for the vitamins I don't know of any sorry.
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