BEREA, Ohio -- Browns quarterback Johnny Manziel says he's made major improvements on and off the field and is more dedicated to being a professional.

Manziel spoke Thursday for the first time in training camp and said it's "a night and day" difference from where he was as a high-profile, first-round draft pick last season. Manziel's rough rookie year was followed by a 10-week stay in a rehab facility for an unspecified condition.

Manziel says he's committed to his profession, and that "football is my life."

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The 2012 Heisman Trophy winner has had consecutive solid practices, and coach Mike Pettine said Manziel will take some snaps with Cleveland's starters on Friday night during a scrimmage in Columbus.

Manziel is currently Cleveland's No. 2 quarterback behind veteran Josh McCown. Manziel said it's nice being on the field without being the center of attention as he was last summer.