Help your loved one stop smoking

My son knew he needed to stop smoking. He'd just seen his father die at 38 from lung cancer. That was the spark that made him realize that smoking could literally kill him. Unfortunately, every time he tried to stop, he would yield to temptation within a few days. I looked at using a nicotine patch and nicotine gum, but didn't want him to use either. For me, it seemed silly to take the same substance that causes the addiction - nicotine.
I searched for a natural and safe method to quit smoking: Stop smoking
How it works?