In my opinion, no it is not. Jalapenos are not actually spicy chile peppers. They add flavor more than they add heat.But if you are concerned, you can either omit it entirely or halve the quantity. Make sure to remove the seeds and ribs of the jalapeno whether you're using all of it, or half of it. Additionally, do NOT confuse a serrano chile pepper with a jalapeno pepper. Serranos are much hotter (about 10x) and are longer and thinner whereas jalapenos are shorter and more "chubby" or stocky in appearance. Sometimes they can get mislabeled in the grocery store so if you see a longer and more slender green pepper and are unsure, that is a likely a serrano not a jalapeno.