Suitable for firewood - Leyland Cypress?

[Squink]

This makes it sound as if the wood is quite tarry:
The dry heart of the tree is extremely flammable and if it catches fire will burn like a torch.

This note at Wikipedia also raises a red flag for me:

Note: Caution should be exercised when handling tree clippings - after trimming, for example. The sap can cause skin irritation in susceptible individuals.