Engine Smoke test for possible leaking lower intake gasket

I made a smoke machine and routed the smoke into the pcv grommet in the lower intake, so in essence filled the lifter valley with smoke what I saw was the smoke exiting the nipple where the brake booster hose normally goes on upper intake elbow. Wouldnt that indicate a leaking lower intake gasket by allowing the smoke into the ports of the lower intake and back flow into the upper intake and out the vacuum nipple.