If you are set up properly, ventilation and filter, it won't be noticeable.i am probably going to start again in the fall. fewer plants. started 5. all sprouted. one was weak. the 4 left were in good shape until i poisoned 2 accidentally. my 4x4x2 tent is too small for more than 3 plants. probably wont refrigerate the seeds and will take my chances. my home is not really secured that well. i will need to re-tool for my next grow. too many of my kids friends come around and i get paranoid or maybe realistic...