The smoke was not noticeably harsher. The high was slightly more prominent than usual, even after having already smoked 1/2 a joint and a bowl this morning. I smoked around 2/3 of the joint.

The oven didn't smell too badly, a noticeably odor only appeared around 20 seconds left to cook. I'm letting the oven air out now, I'll test for smell and post back.

In conclusion, it's not too bad, if you have the time to do it I recommend it. Not so amazing that it warrants doing it before every smoke however.