i agree with LIP
im only 15, and i blaze almost everyday i blaze only wen i have a freehouse or wen my mums around
so i blaze in my room and hotbox it and i just sit in my beanbag chair lisning to some good DJ shadow, but the main point is just smoke and dont worry about the smell, eventually the room will smell like it and your parents will get accustomed to the smell of weed/bedroom odour so its not that bad