Unsafe woods/branches include;
Trees that bear pit containing fruits are NOT safe woods to use. These include; Apricot, Avocado, Cherry, Nectarine, Peach, Plum, etc.
Other unsafe woods include (but are not remotely limited to); Box Elder, Boxwood, Cedar, Oak, Pine, Red variety Maples, Walnut, etc.
I'd think they're both no-no's :( Sorry!