I can see where your coming from on this but i smoke in my rooms all the time. Plants dont seem to mind as far as yeilds show so ive written that theory off. It takes up to six months for some of my gear to come down and with all the work involved some type of smoking is inevitable if you work with smokers. And the end product goes up in smoke anyway right? Btw, my grow room stays immaculate at all times. Swept at least twice a week. Ive seen some bad ones and no way. Keep it clean with no pets forsure. Unfortunately i do find ALOT of girls hair on buds when i trim. Damn girls.