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Quit smoking, control yourself, and if you can't do it, turn your attention and find something else to do.
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Smoking is harmful to health.
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Learn to adjust your mindset.
Find a good time, pretend to have a bad stomach, and then the teacher may ask you, "What's wrong," and you will say that you are in a hurry and want to go to the bathroom. At this time, if it is not a particularly important course or a particularly tricky teacher, it will generally agree to you to go.
I used to do this a lot when I was in school, usually until the classroom where the teacher had come, and then a word, holding the book and standing in the back, and then, there was no then.
After going, there is no way to do it, honestly, it's okay.
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