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We have good SNOMED (however, it Is observation) for that: Time since stopped smoking There are at least 2 reasons for that: 1) smoking affects health significantly, but with time effects of it on the organism become less and less plus 2) smoking questionaries usually have that question in one or another form, we can easily store this information without any History of concepts

Studies showed that smokers using CBD inhalers cut their cigarette use by 40% in just one week, while the control group showed no reduction

as they're making the stuff

Biological agents These include various viruses, parasites and bacterial infections which predispose the patient to develop certain cancers