Oh, I'd say you're almost definately clean. And I mean, you wouldn't even really have to worry about the impact of the car thing unless being in there made you feel high..so. =)

It's just impossible to say. If you haven't for 4 weeks you'll probably be good to go.

1. Exercise
2. Drink lots of water
3. Drink lots of cranberry juice
4. Don't eat fatty foods.

Do not listen to any of these people. First of all, you CANNOT pee dirty from secondhand smoke unless you've spent HOURS of unventilated inhaling of it. and i mean ALOT of hours. Secondly, cranberry is no more effective than water, water is still the best. Third, water DOES flush your system faster and more effectively than anything else, and exercise does help,(it's the sweating). Fourth, not everyone cleans out in a month, it depends on how heavy a smoker you were before you stopped, how long you did it, etc. Fifth, I would advise not eating anything the day of your test, drink plenty of water, and of course, don't smoke. My advice to you would be to test yourself before you go in, instead of going in blind and hoping for the best. The tests are cheap, and accurate. I don't know where you live, but I bet you could find drug tests at vitamin stores, or possibly a head shop. That's where i have found them. If you are not clean, all drinking a ton of water will do is make the test inconclusive, which depending on who's testing you, may or may not be a fail. Test yourself, if you're still dirty, buy a cleansing drink. They work. Good luck.

Yeah drink lots of water and exercise should get rid any traces however I've heard that it will still be noticeable in your hair if its tested which you cant get rid of unless you cut it off. But apparently hair tests only look at the last three months worth so after then you will be ok.

You will be fine. Do not do anything abnormal starting from 3-4 days before the test that means no exercising. Drinking water is useless except for the hours preceding the test, it does not flush your system.. drinking water is used solely to dilute your urine, so its only effective to drink extra water just before the test drinking gallons a day will not help any.... In your case I would do nothing abnormal, just take it easy and don't smoke. 5 weeks is plenty of time especially considering your body type.

Edit: It appears there is a lot of misinformation here. If you actually think drinking 3-5 gallons of water will help you, go right ahead. Exercising is good, but it has nothing to do with sweat. It increases your metabolism there for ridding of toxins faster, this is why you do not want to excersice on the days prior to your test. You dont want the thc to come to the 'surface' and urinate it out.

Don't do anything extra prior to your test, drink some water, make sure you urinate atleast once before the test takes place, and if you want to be ultra safe pee in the cup midstream.

Five weeks is plenty of time no matter how much you were smoking considering your body type. Lots of people have claimed horrible results from the cleansing products.. but it doesnt matter because you will be fine.