lol i am in the same situation as you but i havnt thout of hte smell yet, i plan to only have 2 plants in a pretty small cabinet, lol I am hoping that they dont recognise it ill put up a room odorizer and say its that lol.
I done the same, i got a lock on my door (not the cabinet yet) and there is light cracks in the door of the cabinet lol so i lean a folded up chair with a jumper on it against the door lol and when parents do come in its like a big MIssion impossible where i sit, adrenaline pumping through me, and they like talk or get somethoing and leave, and i sigh with relief lol...

good luck! hope you dont get caught!