I have stopped smoking since 1 month (after hernia surgery). what are the main benefits i should expect at this stage?

Congratulations: From now on, the major benefit is a health benefit from quitting smoking. It become more and more dramatic and you are well on the way to changing and saving your life. The second major benefit is saving a tone of money.

Self esteem; Money: Bravo! if you have been smoking for long time than you should feel that you are breathing better, no throat irritation or smoker's cough:-) improved exercise tolerance. However emotionally you might be more irritable and impatient.Which gets better after one month. If you find yourself eating more try sugarless chewing gum; select low calorie food like cucumber and celery to avoid weight gain.