It is estimated that 70% of COPD cases in high-income countries are caused by tobacco smoke, while exposure to environmental pollution is responsible for 60% of cases in low- and middle-income countries

Wrong behavioral habits, addiction to tobacco and cigarettes, abuse of harmful and toxic substances, respiratory system diseases, close-up portrait of a Saudi Gulf Arab young man wearing a shemagh and traditional dress, taking a deep breath from a cigarette, black background Use of harmful and toxic substances, wrong behavioral habits, gestures of euphoria when nicotine enters the body, respiratory diseases, portrait of a young Arab Gulf Emirati man wearing a white kandura and ghutra lighting a cigarette, tobacco addiction, full body image, white background Feeling headache and suffering from head pain, close-up of an Arab Gulf Emirati man wearing a kandura and ghutra, putting his hand on his head with gestures of fatigue and exhaustion, expressions of boredom and depression when quitting smoking, side effects of withdrawing narcotic substances from the body Wrong behavioral habits, respiratory diseases, a close-up portrait from the side of a smiling Arab Gulf Emirati young man wearing a kandora and ghutra, taking a deep breath from a cigarette, addiction to tobacco and cigarettes, abuse of harmful and toxic substances, looking at the camera with pleasure, white background

The use of standardized reference tobacco cigarettes versus commercially available cigarettes may also introduce a factor of variability in experimental outcome, as will the flavoring component of ENDS
Flavor and Strength Options Galaxy comes in multiple flavor/strength variants
In other words, coughing while high results in minor oxygen deprivation that makes you feel light-headed