The integrated graphics is going to cause you to lag in smoke. Even when I was using a ATI Radeon X300 SE (not much better than integrated) everytime there was smoke, my fps will drop to around 15 - 20fps. So the freezing will probably be caused by that. I would suggest you turning down the quality of the smoke in the advanced options in CS. You can change it to the ugliest looking thing possible, but it won't lag your graphics as much. Try that first and see what happens.
Oh yeah, i forgot to add. You should turn off v-sync when playing CS to increase your fps. Also, if it is a fresh install of CS then you should type in these commands. CS is handicapped unless you change some settings
Go into console (~) and enter these commands in:
fps_max 100
rate 25000
cl_rate 101
cl_updaterate 60
cl_cmdrate 40
Try that and see what happens.
LMK if it works