Thats not always i have a myatery seed ive vegged out for 6 and a half weeks and she stunk up my whole house all the time infact so often j dont even smell the mj anymore which is a HUGE security risk but hey their awesome and not a crime anymore lmfao
There are some low odor strains that don't put out much smell and some that reek. You can control the odor with a good ventilation setup and a carbon filter.