Want to know how to hatch a Smoke Dragon? This uncommon dragon was just released into the ecosystem. As is consistent with my philosophy on fastest breeding pairs, the best combo is shown below. No need to spend gems to rush this one, it is here to stay.
Breeding Pair: Blazing Dragon + Snow Dragon
Breeding Time: 14 hours or 11 hours 12 min with upgrade
Price: 100 Gems (Not astronomical, but still pricey)