Yes yes and keep inhaling after the cooldown vibration, particularly if you are at a higher temp setting, and/or a few hits into your bowl, the vapor can still be flowing after the cooldown vibration so I like to keep inhaling to fully clear mine...
Especially after a few hits the buzz to indicate it is at temp is very quick, so then I would say it is less important and you can begin drawing right away, of course you can begin drawing right away regardless, you are just causing the heater to work a little harder as you are cooling it down when it is trying to get to temp...
And don't forget, if you press it once, it will show you your battery level, if you press it twice it will show you which level temp you are on, if you press it thrice it will vibrate an amount corresponding to the temp setting of your level, and four times is how you adjust that temp setting... I found all of this was pretty clear in the manual btw