Consumer or Patient usable blue tooth connected Spirometer with Smartphone APP :  AirNext  from Nuvair  199 Euros.

Metabolic Status Analyzers

Alcohol Breathalyzers

eNose Sensors

Aerekaprobe

Nonin

Toshiba Breathalyzer  for acetaldehyde, methane, and acetone

Breath isoprene analyzer as a correlate for blood cholesterol levels

Nitrous oxide analyzer as a correlate for asthma and other inflammatory conditions.

Mercaptan/Methanthiol breath analyzers

Explosives sniff detector.  from Vaporsense