There are many opinions on this. Some think yes, others no.
Although there would be very few morphs if inbreeding didn't happen, if you were to I would suggest you let anyone know who was to buy them off you that the parents were related.
More experienced breeders and people that are better with genes may well be along shortly to give a better response.
apparently there are few problems with F1 (1st generation) breeding BUT with the number of corns on the market it's sooo easy to outcross rather than inbreed...........
cornsnakes, ratsnakes, bullsnakes, boas and day geckos