Feasibility Study to Use Biosensing Devices to Monitor PA and Resp. Function in Smokers w and w/o Resp. Symptoms/COPD

Inclusion Criteria: * Current smokers who are currently smoking conventional cigarettes with a minimum of 10 pack-year smoking history * Able to use and willing to be trained to use mHealth devices Exclusion Criteria: * COPD exacerbation that has not resolved at least 28 days prior to screening * COPD exacerbation occurring after screening but before the first study visit * Pneumonia or other respiratory tract infections that have not resolved at least 14 days prior to screening * Pneumonia occurring after screening but before the first study visit * Active respiratory disorders: tuberculosis, lung cancer, significant bronchiectasis, sarcoidosis, bronchial asthma, lung fibrosis, pulmonary hypertension, interstitial lung diseases, or other active pulmonary diseases * Any co-morbid medical condition that in the opinion of the investigator would make participation in the study unsafe or unfeasible, including conditions that prohibit completion of exercise testing * Use of supplemental oxygen therapy * Inability to abstain from smoking during the period in which the participant is admitted to the Kazakhstan Academy of Preventive Medicine (KAPM) COPD Center * A history of allergy or hypersensitivity to metal, particularly stainless steel * Any vital sign indicator, for example, hypertension or tachycardia at rest that, at the discretion of the investigator, would make participation in the study unsafe or unfeasible * Women who test positive for pregnancy during screening, lactating women, or women planning on becoming pregnant during the study * Participants using assistive devices like walking aids, as these are likely to interfere with physical activity