Put paper towels or gauze back there and just keep your jaw clenched on that, holding the gauze/towels where the wisdom teeth were. It will keep the clots from gettings sucked out, which is the problem.

Also keep a cup of Ice water with you, smoking heats up your mouth and that will also cause the clots to break up.

I had my wisdom teeth taken out and was smoking within 12 hours. Just keep it cool, and try not to smoke for long periods, kind of take breaks. I wouldn't suggest smoking a whole blunt at once.