What exactly is Adriana Lima smoking on her date with Matt Harvey?

Let’s hope that after-dinner cigarette doesn’t shave a couple more miles-per-hour off Matt Harvey‘s fastball.

New images of the injury-plagued Mets pitcher — from his hot Miami dinner date on Wednesday night with supermodel Adriana Lima — clearly show him sparking up a ciggy after the espresso arrives at their waterfront table.

With Lima at his side, Harvey drags like a pro — just not like a baseball pro — as a dark-suited waiter gives him a light.

Moments earlier, Lima fiddled with something unseen on their candlelit table, then handed him the cigarette, as seen on the video. At one point, she looked over her shoulder in apparent caution.

The Mets’ “Dark Knight” has been pitching well below his usual 97 mph fastball since last year’s surgery for a shoulder condition called a thoracic outlet syndrome.

He and Lima’s very intimate dinner, complete with frequent caressing and kissing, was at Miami’s swankk River Yacht Club was first revealed by The Post on Thursday.

The Mets organization did not immediately comment on Harvey’s public display of inhalation.