Can you get THC in your system by inhaling secondhand smoke? And if so how long will it reamin in your system?

Microscopically small, barely detectable amounts could enter your blood stream if you're in a room full of marijuana smoke. And, the longer you're around that situation, the more you'll ingest.
Assuming you're concerned about passing a drug test, you have very little to worry about. Drug tests for marijuana need to detect a level of 60mcg/Liter in your urine. It is impossible to reach this level due to only 2nd hand smoke.

If you're truly worried about it, stop hanging out with your friends that smoke. That's the safest route of all.

Good luck

Depends on how much is inhaled, if a large amount then yes, but it wont stay in your system as long. i would saya couple of days to a couple of weeks. just better to stay away.

Of Course! Have you ever heard of a shotgun? that's second hand smoke. I believe you can if your around it all the time, or the car or small room has been bonged out over a period of time. If you've been around it for over 2 weeks then its likely it'll stay in your system for 3-7 days. but if your partaking in a bong out episode then much longer then that 2-4 weeks.. If your really worried about passing a drug test drink alot of water and sweat as much as possible! used to be a pot head.... I know how it was!! Hope this helps....

Yes you can. How long it remains depends on how much reaches your system. A LOT of second hand smoke can be equivilant to an entire joint. Repeated exposure builds up the amount of THC and will take that much longer to work it's way through.

"...second-hand marijuana smoke 鈥?buzz producing, or not 鈥?can leave traces of the chemical tetrahydrocannabinol (THC) in your urine for a day or so after breathing the smoke. Usually, the amount is not enough to make you test positive. Most drug tests have intentionally high standards to avoid false positive results due to incidental ingestion of second-hand smoke."
http://www.goaskalice.columbia.edu/1289....