Questions: Smoking cigarettes increases anxiety. only has psychological withdrawal symptoms. increases mental alertness and mental efficiency.

The question seems to be asking about the effects of smoking cigarettes. Let's evaluate each statement:

1. Increases anxiety: This statement is generally considered true. Smoking cigarettes can lead to increased anxiety levels. While nicotine may provide a temporary sense of relaxation, it can also lead to increased stress and anxiety over time, especially as the effects wear off and withdrawal symptoms set in.

2. Only has psychological withdrawal symptoms: This statement is incorrect. Smoking cigarettes leads to both psychological and physical withdrawal symptoms. Nicotine addiction can cause physical symptoms such as headaches, increased appetite, and cravings, as well as psychological symptoms like irritability, anxiety, and depression.

3. Increases mental alertness and mental efficiency: This statement is partially true but misleading. Nicotine can temporarily increase mental alertness and concentration, which is why some smokers feel more focused after smoking. However, this effect is short-lived and can lead to a cycle of dependence, where the smoker needs to continue smoking to maintain these effects, ultimately leading to negative impacts on mental health and cognitive function over time.

In summary, smoking cigarettes can increase anxiety, has both psychological and physical withdrawal symptoms, and while it may temporarily increase mental alertness, it is not beneficial for mental efficiency in the long term.