The responses provided point to the following risk factors that can contribute to asthma:
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Certain viruses - Viral infections, particularly in childhood, can increase the risk of developing asthma and trigger asthma symptoms.
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Air pollution - Exposure to air pollutants, including smoke, chemicals, and allergens, can exacerbate asthma symptoms and increase the risk of developing the condition.
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A diet high in sugar - While not a primary cause, some studies suggest that a diet high in sugar and processed foods may be associated with an increased risk of asthma and other allergic conditions.
In contrast, high cholesterol is not typically recognized as a risk factor for asthma.
In summary, the risks that can contribute to asthma include certain viruses, air pollution, and potentially a diet high in sugar.