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Like you said, smell is mainly determined with genetics, but there are various things that can decrease and increase this also. Most of the smell comes out during flower, keeping the heat down in the growroom should reduce this a good bit, and good airflow is a must in a good grow, getting fresh air in and old used up air out, so you might want to think about getting some sort of venting system down there for more reasons just then smell. With just 4 plants i couldnt imagine the smell being noticeable at all especialy through a brick wall basement though if that eases your worries any.