"Active smoking" refers to the action of directly inhaling smoke from a cigarette or other tobacco products into your lungs. It means you are actively smoking, instead of being exposed to someone else's smoke (passive smoking). Full definition
And not only active smoking, passive smoking causes significant increases in oxidation of the mentioned molecules as well. (healthyeatingharbor.com)
COPD has been mainly attributed to active smoking in adulthood, but some patients are diagnosed with COPD in the absence of a smoking history and only 20 — 25 % of smokers develop COPD... Taken together, these findings clearly point towards the importance of early life for the development of COPD. (sciencedaily.com)
These estimates suggest that substantial health gains could be made, say the authors — a 40 % relative reduction in smoking prevalence and almost 13 million smoking attributable deaths averted and more than 154 million life years gained by 2050 — by extending effective public health and clinical interventions to reduce active smoking. (sciencedaily.com)