I'm making a cake for a diesel truck club my husband is in & I want to have smoke stacks with smoke coming out of them on the cake. I know I'm going to make the stacks out of Rice Krispie treat, but the problem is what do I make the smoke out of????? I was thinking of trying cotton candy & seeing if I could spray it black with that Wilton spray color, but I think it will just disolve 
If anyone as any suggestions I would appreciate it.
I'm not sure if it will dissolve the cotton candy or not, but the cotton candy idea was what I was thinking of. Perhaps if you hold the can far enough away so that it's just misting it, it won't dissolve. The other option (assuming you are making your own cotton candy) is to color the sugar first. I don't remember how to do it, but there is a way to color your own sugar instead of always buying the more expensive specialty cotton candy sugar. You can also use Kool-aid crystals I think, but I'd check on that to make sure.
When using the Wilton spray mists, be sure it's at least 8 inches away from anything you want to spray -- that stuff has a way of spurting and leaving big glops of color (even if you start spraying on a paper towel and move to whatever you want to spray.)
I've used Wilton spray on cotton candy before.....AND, by accident! I was using the spray for something else and my daughter walked into the kitchen with cotton candy and I jokingly sprayed toward her and it hit her candy! It did just fine! I would hold it at least 6-8" away from it!
Also, I have heard other use popcorn (or that puffcorn snack) for smoke and you could spray that as well! I think either would work great!
I would just have white cotton candy if you want it edible
but if not I did see someone use cotton balls you could spray that with no problem
http://www.cakecentral.com/cake-photo_315813.html
don't know if this will be what you are looking for but in my photos there is a cuppa coffee with steam, they are made out of fondant.. shaped the night before and laid flat on my countertop and left in the open air overnight, I stuck a toothpick in the bottom of them before they hardened so I could put it in the cake.... maybe that will help?
Thanks marthajo1! Yeah I made it but no Smoke 
I tried a bunch of different things and was not happy with how they turned out. I still have to put up a photo of it though. I ended up doing a set of tire marks going through it with a chocolate transfer of the logo on top of it. It came out ok I guess. My husband loved it though!
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