Yes. I've had it happen to me.
Leave the stalk alone, and let the wound heal. Takes a couple of days before it starts to dry-up and be less of a threat to develop disease. Once the wound heals, keep from 'filling-up' the straw-like stem you now have with any liquid. Do not fill it (the stem) up, to 'water' the interior of the plant. (it will kill her) Best not to spray until wound heals, too.

After about a week and a half or two weeeks, new growth from the highest internodes will show their first growth spurts. (these will likely form your new colas)
Topping a maturing lady will stunt her vertical growth a bit, but she should fill in pretty good compared to the strains' usual undergrowth habits.
Rusty Trichome Reviewed by Rusty Trichome on . Snapped Stem Yea, i did it accidentally, a probly 4 inch portion of the plant off the top. its a clear snap all you can see at the top is the stem and the hollow portion. As i have never done this before i ask, what becomes of it? Rating: 5