There's very aggressive policing in Smyrna. Most of the crime statistics show that it's non-violent crime, traffic violations and domestic disturbances.
I can tell you for certain that it's safer than Conyers and South Dekalb. I'd take Smyrna over Virginia Highlands, Grant Park or Inman Park any day.
There's individual streets with just low-income population which tends to bring higher crime, like Bates Street, but even then, you'll notice no bars on air conditioners or windows, and that should tell you something. It shouldn't be too hard to figure out what areas are too seedy for you. Just visit them at night. However, things can change quickly in Smyrna in a matter of a couple blocks. E.g. go a couple blocks West of Bates street, you have some of the most gorgeous historic homes in Smyrna and very little crime. The police keep things from spreading beyond their source, for the most part. As I said, the policing is very aggressive towards stopping crime.
I still own the condo and rent it out. I left it unlocked for a whole week accidentally, vacant. Nothing happened.
There's not many burglaries or car thefts and the few there are come from transients coming to the area versus stuff right here in Smyrna.
Checking with local Law is fantastic. I would check City of Smyrna as well as Cobb County for the unincorporated areas that they cover. As far as pest control. Not sure on that part of the question. Feel free to call me or reach my on my site http://www.smyrnahomefinder.com. If you want you can message me on my site on the area that you are looking at and I will tell you everything you want to know on that. If you have a Realtor I will only give you information that will help you and your Realtor as a courtesy.