Geno Smith wore the face of poise and optimism and the confidence of a man who knows the deck is being stacked in his favor in his quarterback duel with Michael Vick when he and the Jets reported for training camp Wednesday at SUNY Cortland.

Here’s my advice for him anyway:

Watch your back, Geno.

The honeymoon is over for him. He isn’t a rookie anymore. Coach Rex Ryan won’t be throwing Vick into garbage time of the Snoopy Bowl. Smith was drafted by general manager John Idzik to replace Mark Sanchez. Vick is a win-now insurance policy designed to hold Smith’s feet to the fire and possibly to save Ryan’s job. This is no rebuilding year, not with that playoff defense.

“I’m gonna take every single rep as I always do to the fullest of my ability, and try and become the quarterback that I’ve always planned to be,” Smith said.

He was asked if he expects to be the starter if he stays healthy.

“I expect to do well. … I expect to go to practice and earn my stripes,” Smith said. “That’s really all I can say about that. The coaches are gonna make those decisions, and God willing, if I stay healthy, I will hope to be the starter.”

The Jets all are on the same happy page, telling everyone who will listen how terrific it is to have this kind of competition at quarterback, when the reality is only a handful or so of teams do not have their iron-clad franchise QB in place.