Look at your computer. Take out any screws you see (probably phillips head screws). Then try to open the case. The hard drive on an old desktop computer will probably look like the attached photos. There will be one or two bundles of wires attached. You can pull them off or cut them.

If you can't find any screws, open the case with a hammer or axe (best done outdoors). Since you're throwing out the computer, any damage will be unimportant.

When you find the hard drive take the axe to it or a very large hammer. That will destroy any information left on it. If you don't have an axe, a large brick or rock could do the job, preferably something over 20 lb. Do this on a solid surface.

If you don't have any luck with the above steps, find a neighbor with a kid over the age of 10. They will most likely be able to find the hard drive and smash it up. If the disk is smashed well, it will be unreadable and your data will be safe.

Thanks M,
I initially tried to control the smoke by Shooting in a hallway with pocket doors to minimize all movement and use a pocket blower to guide the air. Now I am not as concerned about directing the smoke as long it not a typhoon. A little air movement is fine, it's more about the lighting. I haven't completely sorted it out but I use colored LED's from the sides and 2 flashes with snoots made from printing paper and rubber bands. I have used an assortment of lenses, at first macro then Telephoto, all resulting in a unique characteristics. Here is a link to some shots where I do explain more specifics on how I got the shots and will tell you what the exact setting and lenses. https://www.flickr.com/photos/larrygoeb/albums/72157711787239331