Table 1.

Annotation examples (bold font indicates labeled span)

Entity/label	Examples
status/tobacco-unknown	Currently employed.
status/tobacco-none	She does not smoke.
status/alcohol-current	He occasionally uses alcohol.
status/drug-past	He used cocaine in the past.
type	He occasionally has a beer.
amount	He smokes less than a pack of cigarettes daily.
frequency	She occasionally uses alcohol.
exposure history	...smokes half a pack per day for 30 years.
quit history	The patient quit smoking 17 years ago.