gonzalohm parent
You would need a pretty good sensor to detect a temperature increase from lighting a cigarette. Most likely, the hair dryer has a hair stuck that gets burnt once turned on
Or perhaps formaldehyde release from hair spray and other chemicals partly due to the heat of the hair dryer, but also released because of the agitation and wind.
Technically I think perfume, sweat and trace amounts of smoking residue, including formaldehyde, from personal belongings could probably also raise VOCs as hotels often have very, very poor airflow by design - open windows and balconies have historically encouraged smokers so they were removed, but now you can rarely find any hotels with fresh air in the rooms, and those you find often smell of cigarette smoke for obvious reasons. (Smokers will often stay at hotels with airflow or balconies and take advantage of these features when they can. Also, airing out a room will kill a scent temporarily but only cleaning the room or replacing natural textiles will permanently remove the scent when the window is closed.)