Introduction:
Smoking is the leading preventable cause of death around the world. Several studies have shown a strong association between cigarette smoking and atherosclerosis, myocardial infarction and death from coronary artery disease. Social media encompasses interactive web and mobile platforms. Popular social media can extend the reach of smoking cessation efforts.

Objectives:
This quasi-experimental research; one group pre-post-test design aimed to compare knowledge and attitude on smoking cessation among coronary artery disease patients after cardiac catheterization before and after the program.

Methods:
The study subjects were 7 patients with coronary artery disease who current smoked and admitted at Coronary Critical Care Unit. The subjects were purposive sampling. The subjects received the smoking cessation website which divided into 5 parts: 1) toxic and effects of cigarette on coronary artery disease, 2) mechanism of smoking, 3) withdrawal symptoms and management, 4) smoking cessation and herb, and 5) smoking cessation services. The subjects completed the self-administered questionnaires before and after receiving the website. The questionnaires consisted of demographic data, the data related to smoking, the Heavy Smoking Index (HSI), the Knowledge of smoking cessation questionnaire, and the attitude of smoking cessation questionnaire. Descriptive statistics and Pair t- were used to analyze the data.

Results:
The results indicated that after received the program, the subjects had knowledge in high level (x ̅ = 16.71, SD =.76) higher than pretest (x ̅ = 12.57, SD =1.40). Most of the subjects had attitude in moderate level (x ̅ = 3.47, SD =.50) as pretest (x ̅ = 3.64, SD =.68). The major findings were as follows: 1. Knowledge of coronary artery disease patients after the received the smoking cessation website was significantly higher than that of the pretest phase (t =- 5.879; p < 0.01). 2. An attitude of coronary artery disease patients after the received the smoking cessation website was not significantly (t = -1.162; p .289).

Conclusion(s):
The result suggests that the smoking cessation website can increase smoking cessation knowledge in persons with coronary artery disease smokers.