Dude dom't worry about smell. Smell is extremely easy to get rid of. I smoke in my room with my parents home and I don't even open my windows. Just make a doob tube with paper towels in the part closest to your lips and use dryer sheets in the end. And when you finished make sure all windows and doors are closed and smoke. When you finish spray a 10 second squirt of a odor neutralizer that defeats smoke. And let it sit for about 20 minutes. When you come back the smell will be really faint if even noticable. Just let the room air out and no one will notice. I smoke all day I just stay stonmed unless I'm in school. I never get caught.
This might not make much sense I'm pretty high.