Golden Globe and Emmy winner Alec admits he was an alcoholic!  And worse!

The 30 Rock thesp reveals in a candid interview in new book Moments of Clarity, that he began boozing heavily after his career lifted off in his 20s.

Not only was he a booze hound but he would snort coke all night and then deal with his other addiction – playing video games!

In between film roles, Alec revealed, "I would play video games from 9am to 11am, and I would wind down.

But then one day he had a revelation: "I’m driving down the road, I’m having a drink, It’s 4 o clock; I’m supposed to have a drink.

"But one day I went, ‘I don’t see anybody else in their car with a plastic takeout container filled with ice and wine. They’re drinking coffee and they’re drinking diet coke. They’re not drinking wine."

Weeks before his 27th birthday, Baldwin joined a support group and kicked his addictions privately, he confided in the book written by Rat Packer Peter Lawford‘s son, Christopher Kennedy Lawford.