Bupropion: This is an antidepressant and is used as a first-line smoking cessation aid. It helps reduce cravings and withdrawal symptoms, making it easier for individuals to quit smoking.
Mirtazapine: This is an antidepressant with sedative properties. While it is effective in treating depression and anxiety, it is not typically used for smoking cessation and has no significant role in helping individuals quit smoking.
Varenicline: This is a nicotine receptor partial agonist that is specifically designed to help people quit smoking by reducing cravings and withdrawal symptoms. It is one of the most effective medications for smoking cessation.
Both a and c: This is the correct answer. Both bupropion and varenicline are commonly used in combination or separately to assist individuals in quitting smoking. They help by reducing cravings, withdrawal symptoms, and the pleasurable effects of smoking.
Thus, the correct answer is Both a and c (4), as both bupropion and varenicline are effective medications for smoking cessation.