I don't think so and I think it depends on why you left.
I was born and raised a JW. I drank quite a bit in my 20's both as a JW and after leaving. I think it had more to do with the culture and my youth. It was a drinking town. My worldly friends loved to go out drinking and I hung out mostly with them.
I don't think it changed when I left because I don't think I was traumatized. I never really liked being a JW and doing JW things, but believed it was the truth. When I read Franz's book and realized it wasn't the truth, one might argue that it was the excuse I was looking for to leave.
Sure, I may have drank a little more after leaving. But that's probably because I didn't have to wake up Sunday morning and could go to after parties. Leaving also made me re-evaluate the morality of different things banned by JWs. So I did do more things that were banned. But it wasn't going wild, having to do everything I was denied and get it all out. Not even close. Only doing what felt morally right as things came up. Basically more casual dating and trying some drugs. Even cigarettes and cigars.
Don't do drugs now, don't smoke, don't casually date. Don't even drink much except when out with friends and rarely hard liquor. I rarely get so much as a buzz. Parenthood and maturity also have a lot to do with that. I do enjoy beer though.
I can see being a gung ho JW and having all your beliefs shattered and turning to alcohol and other vices. For me having my beliefs shattered was a good thing.