Having had poor roommates in the past, and having spoken to several friends with poor roommates, I would have to mirror BlueSky's original post and advise you to give this one a pass. I completely understand wanting to move out of your parent's place and strike out on your own, but all of the details you've given about the place and how your friends live in it sound like the makings of a miserable experience. The don't seem to give a damn about the cleanliness of the place, and if you do at all, you'll end up doing all of the cleaning. It gets VERY old VERY fast cleaning up after adults who should be doing it themselves. On top of that, everything you own will reek of cigarette smoke after having been in the house for a week. This includes your clothes, your bed, EVERYTHING. You'll take a shower and feel clean, and the moment you step out of the house and clear your lungs of the smoky air, you'll realize that your clothes, hair, and skin all smell of stale smoke.
Now, on the other hand, if you want to not be a burden on your parents, and you want to learn how to do some home improvement stuff, why not do this... take a few hundred bucks a month, and improve your parent's house. That much money will buy a new bathroom sink and faucet, which you can then install... new ceiling fan, bits of this, bits of that. If you can't think of anything to add one month, roll it into the next month, or take a trip to Sears and buy tools. Your parents will appreciate it, you'll be learning, and you'll not reek of other people's disgusting habits. (I fully understand that there might be additional interpersonal reasons that you want to move out, but you didn't mention any...) So, spend $200 a month improving your folks' place, and save the rest. Let your other friends know that you're looking for a place, and you never know... maybe one of your non-smoking friends that cares about their home will want to move out.
Guntotin_fool is no fool... "not screwing yourself over" is not being "self centered". If your friends wanted to improve themselves, they would be taking care of their pet properly (IMHO, they shouldn't own a dog), as well as their landlord's property. The question I would ask: "If they care so little for their landlord's property, how are they going to treat mine?" If they destroy or damage something of yours, will they have the money to repair or replace it? Will they care?
Good luck, man.