Oxygen saturation is the level of oxygen present in the blood.  I had mine checked today and it's 99%.  
If vaping had a negative effect on lung function, as some critics have said, it would most definitely not be 99%, as I've been vaping for over 3 years already.
	
		
			
		
		
	
				
			If vaping had a negative effect on lung function, as some critics have said, it would most definitely not be 99%, as I've been vaping for over 3 years already.