its very minor , but im sure its strain dependent but i think in general they dont stink that bad at all in veg , nothing a spray of air freshener cant kill.
i mean unless you have like 50 plants goin , i wouldnt worry about it most people do not use carbon filters for their veg chambers , i personally dont and have 3x ak48 and a bubblicious clone about 7-8 inches high now , i dont smell anything lol...a yard or two away from me.