Not only do triploids produce significantly less seed than diploids when heavily pollinated, the cannabinoid levels of the biomass are virtually unaffected by the seed production.
We love our triploid cannabis varieties, bulked up production, better aromas, and great resistance to pollination. That said, in the right conditions even our "Seedless" varieties may produce some seeds - but it is great to see how our triploids cannabis varieties performed when surrounded by pollen dusting grain and fiber crops - check out the data from Cornell University.