Can this detect cigarette smoke specifically?

If by "detect cigarette smoke specifically" you mean, does the Temtop list the specific causes of unhealthy air, no it doesn't. However, it will change the level of air polution when cigarette smoke or other polutants in the air in 2 specific readings: the level of PM2.5 polutants, listing them as healthy or unhealthy, and of AQI of Air Quality Index, listing it as good, moderate or dangerous. I find it extremely helpful.

Why did the manufacturer unnecessarily shrink the third digit in 3 of the 4 fields? Looks unattractive.

I imagine it was a better alternative than using space for a decimal point.

What type/size of battery is used? How many batteries are required? Are the batteries replaceable? Assuming rechargeable type, any limit on max mAH?

It's a built-in rechargeable battery. Uses USB-C to charge. Battery life is quite good.

Most of the reviews complain that the battery has a short life. Would there be any problem if I left it plugged in 24/7?

Keeping the AirTemp on 24/7 will dramatically shorten its life. However, it is very easy to turn on and off. I turn mine on for a minute or two three times a day which lengthens total battery life from as little as 4 hours to as long as more than a year.

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Description

🌿 Breathe smarter, live better — the future of indoor air quality is here!

LONG LASTING POWER - Enjoy up to one month of continuous use in eco-mode—perfect for busy professionals who demand reliability without constant charging.
PRECISION AT A GLANCE - Experience ultra-accurate temperature and humidity readings with ±0.9°F precision, ensuring your environment is always optimized.
SLEEK SLIM INNOVATION - 30% thinner than typical hygrometers, this device fits seamlessly into any modern workspace or home setup.
SMART MODES FOR SMART LIVING - Choose from Smart, Real-time, Interval, and Eco modes to tailor monitoring to your lifestyle and save battery life.
NEXT LEVEL AIR QUALITY INSIGHT - Monitor harmful PM2.5 particles in real time—because your health deserves more than just temperature data.

The Temtop Indoor Thermometer Air Quality Monitor combines precise temperature and humidity measurement with real-time PM2.5 detection in a sleek, ultra-thin design. Featuring ±0.9°F accuracy, four intelligent operating modes, and up to one month of battery life in eco-mode, it empowers professionals to maintain a healthier, smarter indoor environment effortlessly.

Specifications

Colour	white
Brand	Temtop
Item Weight	0.35 Pounds
Operating Humidity	99 percent
Temperature Accuracy	0.5 °C
Manufacturer	Elitech
Model number	S1
Number of Memory Sticks	1
Tracking Method	Laser
Special Feature	High Accuracy
Specific Product Use	Humidity, Temperature
Item Weight	159 g
Product Dimensions	3.2 x 13.8 x 10.6 cm; 158.76 g
Batteries	1 Lithium Polymer batteries required.
Item model number	S1
Item Height	10.6 Centimeters
Item Width	13.8 Centimeters
Power Source	Battery Powered
Resolution	0.1 degree fahrenheit
Included Components	charger,S1, user manual
Are batteries included?	No
Lithium battery energy content	2.96 Watt Hours
Lithium Battery Packaging	Batteries contained in equipment
Lithium battery weight	0.85 g
Number of lithium ion cells	1
Number of lithium metal cells	1

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