Are there any products or exercises that can help maintain smoking cessation after three months of quitting?

My father was injured in an accident, so he underwent surgery and was hospitalized.

During the surgery, a lung test was performed, and it was noted that lung function had significantly declined due to long-term smoking.

During the approximately two weeks you stayed in the hospital, you were forced to quit smoking, and you kept saying that you would smoke again after discharge, but so far, you haven't been smoking.

It's hard to believe that three months have already passed.

Of course, you might have smoked somewhere other than home, but considering that you used to smoke more than a pack a day, it's a remarkable improvement.

After being discharged, I inquired about the smoking cessation program at the public health center, and they told me that if about a month has passed, the nicotine or whatever in the body would have almost completely cleared, so participating in the program would be pointless.

You need to regain your health, and if you try again now, there may be no chance to quit later. I really want to help you quit this time.

Methods, snacks, products? Tools? Anything is fine to help maintain long-term smoking cessation.

Among the senior non-smokers, please share any tips for maintaining abstinence from smoking.

Of course, one's own will is the most important, but still ㅠㅠ