Can adults smoke in the park

Only in selected areas

I am aware of one smoking area each in fantasyland, frontierland, and by the haunted mansion. There are also 3 smoking areas in California Adventure.

In Disneyland there's only 1 place which is behind Big Thunder Mountain Railroad in Frontierland. In Disney California there's only 1 place behind Grizzly River Run in Grizzly Peak.

They have designated areas