It wasnt laced. Weed doesnt get laced. It's so rare it's almost certain you'll never smoke or even see laced bud.

Something that no one else seems to have mentioned, the buds are made up of false seed pods. Normally they'd be a seed in it, but as the plant probably wasnt pollinated, theres no seed, just air, so as you burn the bud it might have been that.

Nothing to worry about though.