the two main things people use for fog are incense sticks or a fog machine, I picked a fog machine at Spencers for $40 and will fill a small room in seconds, needing only short bursts to maintain a thick haze
fog spray works but it's a one time use thing - for the cost of a can of fog i could get a jug of fog juice for my machine that will last months of occasional use
Check out walmart for fog machines. I got mine a few years ago before I was even into lasers for just under $20, it hasn't failed on me yet. I got mine a few days before Halloween, but I think sells them around the 4th too.
I just ordered a used 680 watt sharky fog machine on ebay for $40. Im thinking it will be way overkill for my dorm room but i will post an update on how it works when it shows up.
The cheap foggers from walmart and spencers seem to be OK for laser use, but since i havent owned one i dont know. My fog machine cost about $300 at the time, but i also DJ, so lots of output is a must. The fogger is rated at 2.7KW and can fill a medium gym in about 6 seconds with good airflow. I am looking into buying a hazer wich is much better than a fog machine for lots of things. Deffinatley go for a fog machine, the fluid lasts for ages and is cheap.
Works well and fills the room in seconds. As someone above said the cans are just a one use thing really, for the same price you can buy a bottle of juice that will last months. I actually only use my fogger 2 or 3 times a month and I am still on the first tank from when I bought it.
It doesnt take much of juice to fill a room either, I left mine spraying it out for 2 mins and looked at the tank after and there was barely and difference in fluid levels at all.
Just so you know (estimating how powerful a fogger to buy) a 400W fogger will fill a typical closed 2 car garage "so-so" (takes a few minutes to do it). A more powerful one would have been better, but when I bought it I wasn't sure what power I'd need.
well people can breathe fog machine for for hours on end at parties so i doubt your chinchilla would like die from it - if you're worried you could put the cage in the bathroom or something while you fog an area