I been trying to stop smoking.

I started smoking when I was 14 and it always been an on and off thing. I had stop smoking probably about 4 months 3 years ago and that was the best I ever felt not depending on it. Now I make about a year in February that I been trying to stop smoking. I don’t know why it’s so hard for me it’s taking a toll on my life my family my relationship I’m not as productive as I use to be and I’m over eating way too much. If anyone has some advice I would highly appreciate it