It is unlikely 4 hours of heat 2 weeks in are going to cause your plants to hermie. If they do, they probably would have anyway as this would be indicative of a very unstable strain. I have a strain that hermies no matter what I do right in the end, they'll pop some bananas. Fortunately, the pollen they produce isn't viable and rarely produces a seed. I run perpetual in this room so there are plants at 4 different stages of flowering.
I have another strain that I have made every mistake in the book with and couldn't get her to spit out a male flower if I tried.
Keep in mind if you are planting a seed that you found in a bag of high grade, it is likely the product of self pollination and will almost always produce a hermie in the end. This doesn't mean the smoke is bad and it doesn't mean seeds 100% of the time.