LOL - I wonder if you could use a Black + Mild cigar, for a smoke test!
1) Remove air filter
2) Put plastic warp around filter.
3) Install air filter, you don't want smoke coming out of the air box during test.
4) disconnect the vacuum hose going to the brake booster.
5) Light a cigar
6) Slowly blow smoke into the intake booster hose, than plug with thumb.
7) Watch for smoke leakage.
Don't forget to remove plastic from the air filter when done.