How long will it take for your body to be clean after a one time use of smoking marijuana?

Probably not long - maybe a week at most.

The chemicals that they test for are the THC and THC Carboxy9.
The Carboxy9 is what they test for in Urine tests


The numbers below are those that are reported by NIDA

For Urine tests

For infrequent users it will usually show up for up to 10 days

For users who use daily or several times a week they stay longer. So it will usually be there anywhere from 2 weeks to a month depending on how much they are using.



In blood tests they usually only test for THC Not the THC Carboxy9 Though they can test for both.
The THC Blood test for those who do not do it often show 3 to 4 hours For Carboxy blood test for people who do not use it much it shows for 2 to 3 days.
For those who do it a lot The THC tests show 4- 8 hours and The Carboxy 9 2 or more weeks.

Because the carboxy9 stays the longest this is why this one is most often tested instead of just THC.

Hope this helps

Bay

Check it. Depending on your body weight, it should take no longer than 3-4 days. Don't drink caffiene, and just subsitute anything you think with water. That's all you need my friend :)

Drink a lot of cranberry juice and THC will be out of your system in a day.