Where used:

Attribute	CIGARETTES PER DAY	has attribute TOBACCO USAGE
Attribute	DATE STOPPED SMOKING	has attribute TOBACCO USAGE
Attribute	NUMBER OF YEARS SMOKED	has attribute TOBACCO USAGE
Attribute	SMOKING STATUS	references in description TOBACCO USAGE
Attribute	START DATE	has attribute TOBACCO USAGE
Attribute	TOBACCO CHEWING HISTORY	references in description TOBACCO USAGE
Attribute	TOBACCO USAGE TYPE	references in description TOBACCO USAGE
Class	PATIENT	references in description TOBACCO USAGE
Data Element	YEAR STOPPED SMOKING	references in description TOBACCO USAGE
Diagram	NCD5	displays TOBACCO USAGE