E-cigarettes are electronic devices that heat and vaporize a glycerine-based liquid, containing nicotine and various kinds of flavorings. The device contains a liquid cartridge of the flavored nicotine, a heating device that vaporizes the liquid, and a battery. E-cigarettes deliver nicotine, which is an addictive drug that causes other health problems such as heart disease. In addition to nicotine, e-cigarettes can release cancer-causing agents such as nitrosamines and diethylene glycol, an ingredient commonly found in car antifreeze. Other impurities including metals and silicate have also been found in the vapor released by e-cigarettes [1]. The increased use of e-cigarettes among young people is of great concern to many public health experts as the manufacturers of e-cigarettes are targeting teenagers and young adults through advertisements similar to tobacco ads decades ago. These advertisements certainly have been effective, as one study showed that an estimated 2.39 million high school kids vaped in 2015 [2] that is about 13 percent of US high school students. By comparison, 1.37 million high school kids smoked cigarettes. The biggest concern regarding the increased use of e-cigarettes by young people is that this will lead to the eventual use of real cigarettes. In addition, the dangers of e-cigarettes on allergies and asthma cannot be fully dismissed. Impurities found in e-cigarettes could trigger an asthma attack or worsen nasal allergy symptoms, either by the person using the e-cigarettes or even from a person exposed to the "second-hand" vapor emitted from the device. The true effects of the increased use of e-cigarettes are not fully understood. Moreover, it is important for people to realize that these devices are not a completely safe alternative to smoking real cigarettes. For example, it is reported that e-cigarettes emission is a new source of volatile organic compounds (VOCs) and fine/ultrafine particles in the indoor environment resulting in passive smoking [3]. It was also shown that the increase in formaldehyde and acetaldehyde were easily detected in microgram concentrations [4]. In addition, the influence of electronic cigarette vaping on indoor air quality (IAQ) has shown a quantitative increase in particulate matter (PM) due to the exhaled aerosols in the PM10, PM2.5, and PM1 standards [5]. Zhao et al, confirmed these toxins to IAQ change took 4-10 minutes to return to background levels of PM [6]. Another study suggests that chemicals from e-cigarettes can drift through buildings and deposit on the surface in spaces where e-cigarettes are not being used [7]. The World Health Organization (WHO) recommends e-cigarettes not to be used indoors to minimize the risk to bystanders of breathing in the chemical emitted by the devices [8]. All these facts point out that the emission from e-cigarettes is very likely to be a new source of indoor pollution. The main problem is that we do not know the long-term health effects, especially for children and adolescents since this is a relatively new source of pollution. Therefore, there is an urgent need to develop an integrated e-cigarettes emission monitoring system to quantify the exact concentration of e-cigarette emission and to collect/analyze the data to address this emerging health crisis. In this work, we demonstrate a low cost and portable monitoring system for e-cigarette emission. We discuss the sensing responses to total VOC (tVOC) and PM from e-cigarette to clearly show the system can distinguish the e-cigarette emission from ambient.