It doesn;t matter whether you smoked a year or 50. We are addicts to nicotine and the habit of smoking. I think a 3 month quit is more significant than years quit, as it is those first few months that people find most challenging.. After that time, it does become easier, perhaps because you have learned about yourself, believe in yourself and see that quitting smoking is possible. BELIEVING in yourself is key. Positive thinking is key.
After 5 years I don't even think about smoking. I don't miss it one bit. I love my new lifestyle and very thankful for it. It enabled me to retire early and enjoy better health. I am so thankful that my spouse and daughter also quit. It is for that reason that I am determined to give my support to others in their quits.
If can ! quit, an addiction of 45 years then anyone can.