Eucalyptus leaves are anti-bacterial, anti-inflammatory, anti-fungal, anti-viral. They have pain killing properties, are anti-microbial, reduces anxiety and can assist in helping to reduce blood pressure. It increases ceramide production in the skin, which increase moisture content to counteract dry skin.
So can Eucalyptus leaves be toxic? YES they can be. Do not take the essential oil internally or eat the fresh leaves. Rather prepare the leaves in ways mentioned above.
So if you can, go ahead and pick yourselves a bunch of Eucalyptus leaves, and have some fun with them.