Yes, the heat level is adjustable. For less spicy popcorn, add less chili oil. For 1/2 cup of popcorn kernels, I recommend a total of 3 Tbsp of oil. The combination of regular cooking oil PLUS chili oil will infuse the kernels with maximum flavor and heat while keeping the kernels fluffy and crisp.
For bold spicy flavor: 1 Tbsp regular cooking oil + 2 Tbsp chili oil
For subtle spicy flavor that’s less intense: 2 Tbsp regular cooking oil + 1 Tbsp chili oil