Cap. is completely safe if that's all your using and has been used for many, many years
for example"http://www.canadiancountrywoman.com/garden/bugrecipes.php"
Black pepper, chili pepper, dill, ginger, paprika, and red pepper all contain capsaicin, a compound shown to repel insects. Synthetic capsaicin is also available for feild use. Researchers have found that as little as 1/25 ounce of capsaicin sprinkled around an onion plant reduced the number of onion maggot eggs laid around the plant by 75%, compared to a control plant.
And the defense spray I was talking about is only capsaisin and I was talking about spraying it near the soil, not the buds. Capsaicin the the active ingredient that is extracted from hot peppers and is safe for use on humans.