I assume if the report is clean, we'll probably just need a few humidifiers in the house.  

Nothing a humidifier can't handle.

Combustion reactions change lots of chemicals into lots of other chemicals, some of them being things like Carbon Monoxide, Tar, etc.Vaping is just basically a humidifier. 

Don't forget to bring a humidifier when you move out here!

Editing to add we are a little more worried than usual (we would probably just run fans and a humidifier and clean up ourselves) but our forced hot air system comes from this basement and we have a newborn baby so really don’t want to be having mold coming through our air vents! 

Not running fans in the bathroom, running humidifiers, not properly cleaning and not venting dryers properly (as you learned).

Turns out the humidifier on the furnace was left on all winter so far and the windows and walls had condensation and mold.

Two big causes of moisture I have observed are tenants running humidifiers and not using exhaust fans when in the shower (make sure your bathroom has an exhaust fan).

My grandmother is one of these people to me, she buys essential oils, and quarter collections, humidifiers and dehumidifiers cause somehow having both running is better than having neither. 

Damage went through the floor and into the ceiling and walls of kitchen and laundry room below.June 7: Insurance company sends someone to inspect damage, set humidifiersJune 10: They come back to remove humidifiers June 14: Insurance submits claim and payment to meAt this point, the tenants father, who is in the business of plumbing and renovations, informs me that they seriously underpaid for the amount of damage.