I don't think there should be any problems. When i was a teenager, i used to blaze in my room when i lived with my parents. They didn't condone any smoking, especially of illegal substances, which cannabis was at the time.
The smell never went through the floor and they never said anything to me about it. So, my guess is that you're in the clear.
If it's legal, you shouldn't be too worried about it. At least not until someone approaches you about it.
If you're new here, please select the answer that helped you out the most by clicking on the "answer" button underneath what the person said. If you have any questions, feel free to message me on here. You can pull up your messages tab by clicking on the little airplane in a bubble. It's located on the bottom-right of your screen.
I hope this helps!