There is scientific epidemiological evidence that physical activity can reduce the risk of having cancers. These reports are mainly based on self-reported physical activity by the partisipants in the studies, which is a limitation of the obtained results. If you want to compare physical activity and risk of having cancers, the physical activity has to be measured. Individual opinions of physical activities vary among individuals and aren’t reliable.
Essential oils are complex mixtures of volatile compounds and isolated by physical means only (pressing and distillation) from whole plant or part of a plant. There are almost uncountable number of single substances and a tremendous variation in the composition of essential oils. Many of these volatile oils have diverse ecological (the scientific analysis and study of interactions among organisms and their environment) functions.