Effectiveness of N-Acetylcysteine (NAC) in Motivational Enhancement Therapy for Nicotine Addiction

The main question it aims to answer are:

Obtain the effectiveness of combination of n-acetylcysteine and motivational enhancement therapy compared to a combination of motivational enhancement therapy and placebo on nicotine withdrawal symptom scores on nicotine addiction.

Obtaining the effectiveness of the combination of n-acetylcysteine and motivational enhancement therapy compared to the combination of motivational enhancement therapy and placebo on craving symptom scores on nicotine addiction.

Obtain the effectiveness of giving a combination of n-acetylcysteine and motivational enhancement therapy compared to a combination of motivational enhancement therapy and placebo in the incidence of abstinence in nicotine addiction.

Obtain the effectiveness of combination n-acetylcysteine and motivational enhancement therapy compared to a combination of motivational enhancement therapy and placebo on blood nicotine levels in nicotine addiction.

Obtain the effectiveness of combination n-acetylcysteine and motivational enhancement therapy compared to a combination of motivational enhancement therapy and placebo on n-acetylaspartate levels in the brain in nicotine addiction.

Obtain the effectiveness of combination n-acetylcysteine and motivational enhancement therapy compared to a combination of motivational enhancement therapy and placebo on glutamate levels in the brain on nicotine addiction.

Obtain an overview of nerve connectivity in nicotine addiction patient through post-therapy frontostriatal fMRI examination.

Evaluate the side effects and severe side effects of NAC administration on nicotine addiction.

Participants will:

Get blood testing for nicotine in 1st, 6th and 12th weeks Fill the QSU-Brief, MTWS questionnaire every 2 weeks for 12 weeks Get motivational enhancement therapy every 2 weeks for 12 weeks Get fMRI in the 12th week Consume 3600 mg n-acetylcysteine for 12 consecutive weeks (for treatment group) and placebo (for control group) Researchers will compare the laboratory, clinical and radiology improvement in both groups

Inclusion criteria

• Male or female who are active smokers are at least 18 years old and decide to stop smoking
• Using tobacco cigarettes whether filtered or not
• Active smoker for at least 6 months
• Smoke at least 10 cigarettes per day
• Currently in the preparation or action stage at the stage of changes
• Able to follow instructions and research procedures

Exclusion criteria

Have/ suspected to have a systemic medical disorder or psychiatric disorder requiring acute management Currently using electronic cigarettes Currently using oral glucocorticoids Have an acute gastrointestinal ulcer Pregnant or breastfeeding or planning to become pregnant within the next 6 months Currently consume n-acetylcysteine Have a history of allergic reactions with n-acetylcysteine or its components Get therapy to stop smoking such as bupropion, varenicline or nicotine replacement therapy (NRT)