Pesticides are very harmful for the health of humans and animals. Pesticides have been linked to a wide range of human health issues. ranging from short-term effects like nausea, dizziness, fatigue and headaches, to more chronic impacts like endocrine disruption, reproductive harm, and cancer.
Studies with lab animals have linked exposure to pesticides with damage of the thyroid, liver, and nervous system, as well as changes in the immune system. The National Cancer Institute found that American farmers, due to regularly handling pesticides, had startling incidences of leukemia, multiple myeloma, non-Hodgkin lymphoma, soft tissue sarcoma, as well as cancers of the skin, lip, stomach, brain, and prostate.
Hemp is one plant that is not dependent on pesticides. Hemp can has actually be used as a pest repellent and pesticide in a variety of formulations. It has been planted as a companion crop to deter insects, nematodes, fungi, and weedy plants. Dried leaves and flowers have repelled or killed insects, mites, nematodes, and weeds. Plant extracts (either aqueous or polar organic solvent extracts) have killed or repelled insects, mites, nematodes, fungi, weedy plants, bacteria, and protozoans.
Pure cannabinoids reportedly inhibit or kill bacteria, fungi, and insects but the validity of some of these reports is debated. Utilizing left-over Cannabis leaves against pests appears to be a possible use for remaining harvest residue.