If you ask people the reason for putting the lemon and chilli in a thread up, they may reply with the story of Alakshmi, (sister of Goddess Lakshmi, who takes away the prosperity from household). As per this superstition, Alakshmi likes sour, hot and pungents substances. People believe that if Alakshmi comes to their door, she would eat her favorite food, and leave without entering their shop or house. As a result they are not deprived of prosperity
As scientific reasons, Both lemon and chillies are rich in Vitamin C. So when a cotton thread is pierced through these substances, the cotton absorbs their nutrients and gradually vaporize them in air. Inhaling this air has health benefits
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