Somethings that I gathered from a different site
Green Dragon Recipes (Marijuana Drink)

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Some ovens vary in temperature range from the actual number listed on the dial. If you overheat the weed, then you'll lose all the THC into the air, and you'll probably get high from opening the oven door. For this reason, you may want to first test the temperature cycle of the oven using a thermometer. Be sure to remove the red plastic piece from the top of the thermometer so it doesn't melt inside the oven. THC vaporizes at 392 �F, so be sure the thermometer never exceeds 350 �F. Alternatively, you can use a lower temperature and longer period of time, such as 200 �F for 20 minutes (pre-heat first). This eliminates the possibility of being too hot (vaporization of THC and cannabinoids) or too cold (THCA will not get you high). Also, some of the other cannabinoids vaporize at temperatures as low as 260 �F, so using a lower baking temperature will give a better and more natural high than THC alone.
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If this is the case then why would anyone make the firecrackers anywhere more than 200 degrees? I did not honestly know that the more heat destroys the THC. So how much heat can you use till the point that your destroying the THC? Any lower than 200 degrees is fine for cooking with cannabis?