Can I smoke once a week and stay clean?

I've been reading the threads here for a while but I don't think I've seen this question specifically addressed.

My system is completely THC-free right now. I'm thin with a good metabolism. I exercise daily and drink lots of water. If I were to smoke tonight it would probably be out of my system in no more than 4 or 5 days. So my question is this:

If I started smoking once a week would my body continue to purge the THC within 4 or 5 days. For example, if I smoked on Friday I should be clean by Wednesday or Thursday at the latest, then I would smoke on Friday again, and again on the Friday after that, etc. But if I continued this pattern would there be a gradual build-up that took longer than the 4 or 5 days to flush? It sure would be nice to be able to have just a few hits of ditchweed once a week and still be confident I could pass a drug test with just a few days notice. Any help or comments on this would be greatly appreciated.

I can't wait to hear the answers to this one. I think FBR would be able to answer this the best.
I have a shit load of home tests on the way and I hope to figure out what MY body does in that same situation. However, it is not an accurate measure since it's a pass/fail and the tests don't give you a number.
My gut tells me it compounds in your system. Your scenario might be too good to be true. But may be true for you and not for someone older, fatter, slower metabolism.

Why not just buy some test kits and find out for sure? Everyone's metabolism is different, so the advice and comments may not apply to you. - Granny:hippy:

This is basically what I do.
I smoke one night a week for about the last year and I'm clean 3 or 4 days later.I'm big 6'1' and 280 lbs.