nope.. this will be my first grow.. perhaps il drill one.. i really do not want to have odor coming from my closet..i've seen/smelled/smoked from both sides and they both can be skunky/pungent.. You probably dont have much to worry about until last few weeks of flower and during harvest, thats the stinkiest time...
just check out the DIY section of growfaq for DIY carbon filter they are easy to make and all you gotta do is just attach it to your exhaust duct.... if you have one?