Here's some info on different types of wood. Wood, Roots, Leaves
From the site:
Most wood you choose will be safe once it's weathered, but I'd avoid "turpentiney" conifers, such as pine, fir, juniper, cedar, etc. Those sharp-smelling resins may turn out to be low-grade toxins.
Everything I've seen says it can release toxins, but nothing specific on exactly what that would be. If they've been fully dried you may be ok, but not sure it's worth the risk. Too many other safe and attractive options out there.
From the site:
Most wood you choose will be safe once it's weathered, but I'd avoid "turpentiney" conifers, such as pine, fir, juniper, cedar, etc. Those sharp-smelling resins may turn out to be low-grade toxins.
Everything I've seen says it can release toxins, but nothing specific on exactly what that would be. If they've been fully dried you may be ok, but not sure it's worth the risk. Too many other safe and attractive options out there.