Some people say this will stress the plants because your artificial lighting simply can't match the sun & the plant will in a sense get pissed when you have it under 24 light, but only half is real sunlight. I don't know if this is true, but they also say that this can lead to the hermaphrodite condition. What you can do is give the plant 2 or 3 weeks of artificial light for 24 hours a day & then put it outside for 12 hours of natural sunlight & bring it in for 12 hours of darkness. I think this way is is probably the best, fastest, most efficient way to grow if you have an area to do so like a shielded yard in a quiet part of town. Just think it's only outside for 12 hours when it's flowering so even the smell might not be a problem like I said depending on your location.