Habit
When you get sick you always eat a hot pepper. It's a habit you've picked up and you can't seem to shake it. One sniffle, one cough, and before you know it, you're eating a hot pepper or two.
Imagine if you had a habit of eating hot peppers whenever you thought you might be getting sick. To be fair, it flushes out your sinuses and tastes good, so it's not the worst habit you could have.
へき
くせ
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Everyone you know has a different habit when they get sick. Instead, they eat couscous (くせ). But you think couscous is gross. It's bland and does nothing for your stuffy noses and scratchy throats. I wonder how you can convince them to replace their habit with your own.
Unfortunately, now you've gotten into the habit of telling everyone what to do when they get sick. "Yeah, yeah, eat a hot pepper, we know. But couscous is better," they say before you can speak. To each their own, I suppose.