The dhumapana, when ignited releases the volatile substances in the nostrils, which are absorbed resulting in vasodilatation and stimulation of surrounding nerves of nasopharynx and the olfactory nerve. This stimulates the endocrine system and nervous system also. Same way when these volatile substances are inhaled and reach lungs, it leads to a soothing effect and eases the difficulty of breathing because of their bronchodilator effect.
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=== Previous research works ===
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