He sure as hell looks like John Constantine. I'm of two minds on the smoking, it has largely been an integral prop for Constantine for years, but it IS only a prop and could be replaced. That having been said "Dangerous Habits" is one of the best Constantine stories and is very much linked to his smoking addiction.
Glad it will be more like Hellblazer was. Downloaded over two hundred issues from the first on up to the early 2000's, and it blew me away how much better than the Keanu version/how much they changed.