You don't want smoke bombs, you need a smoke machine or dry ice - or both. The smoke machine will give you a more repeatable option. If you need to power it you can also invest in some power packs.

You can rent this stuff before deciding whether it's something you want to purchase for yourself.

Read two tips here that are right on target with what I believe you're looking to achieve:

http://www.lightingmagic.com/smokeqa.htm

I remember reading a number of other sites over the past few years about this subject, as well as tech details for posted photos with smoke effects. If I can remember them I'll update. I don't think I have them bookmarked unfortunately.