Exploration of Olfaction Abilities and Genetics in Asian Indigenous Communities - 1) Elucidation and characterization of nasal microbiome profiles of OA in different habitats (deep rainforest/ semi-urban/ urban) 2) Investigation of the influence of gender, smoking/passive smoking and cultural practices on nasal microbiome.3. Investigation of OA respiratory health in association with their nasal microbiome. 4. Exploration of olfactory ability, function and odour detection