We conducted a prospective study for 8 months on a cohort of 45 smokers going to their smoking quitting counsultance at the respiratory care unit of the hospital of medecine and pharmacy university of Ho Chi Minh city in order to identify their tobacco smoking characteristics and eoaluate the effectiveness of three tobacco quitting methodes recommended by WHO on this cohort.: Results: - Tobacco smoking characteristics: +Sex: 95.6% male; Average age: 46.5, 76% have an educational level superior or equal to baccalaurea.