Table 1.

Summary of the smoking detection technologies described in this study.

Product	Technology	iOS	Android	Scientific Evaluation	Price	Participants	Recall *
Lopez-Meyer et al. [1]	Hand-to-mouth and chest sensors			✔	Research Prototype	20	80%
Patil et al. [2]	Hand-to-mouth and chest sensors			✔	Research Prototype	20	61%
Lopez-Meyer et al. [3]	Hand-to-mouth sensor			✔	Research Prototype	20	90%
Cole et al. [4]	App + Smartwatch		✔	✔	Research Prototype	10	89%
Smokesense [7]	Smartwatch		✔	✔	Research Prototype	11	89%
Research by CWRU [8]	App + 2 Armbands		✔	✔	Not on the market	10	98%
CigFree [9]	App + Property Smartband			✔	Starting from $69	100	N/A
SmokeBeat [10]	App + Smartwatch	✔	✔	✔	Free	40	80%
StopWatch [11]	Smartwatch		✔	✔	Research Prototype	13	92%
Lu et al. [12]	Prototypal wrist sensors			✔	Research Prototype	5	88%
Senyurek et al. [13]	Prototypal wrist sensors			✔	Research Prototype	35	93%
Senyurek et al. [14]	Prototypal wrist sensors			✔	Research Prototype	35	97%
RisQ [15]	App + wrist sensors		✔	✔	Research Prototype	15	81%

* the recall values are related to the results reported by the related papers. However, since each paper applies its own evaluation protocol and each work performs the method evaluation on a different dataset, the recall values are not directly comparable to each other. The term “App” stands for smartphone application, CWRU stands for Case Western Reserve University.