No...I keep it natural because you want it more humid in veg room. I get such great photsynthesis that I just use the old...if they look great, then they are doing great, mentality. But really no. You want your humidity around 50-55% in veg and 40% in flower. Higher promotes possible fungus and rot.
good rules: keep your temps at 80f and humidity in low 50's% for veg
for flower keep temps around 70 and humidity at 40%...If possible keep your rez temps in the low 60's for more oxygen...Oh yeah, I almost forgot.
I subscribe to the theory that shorter veg photoperiods promote more females...OK. there I said it again. hope that answered your question. peace