Never take a harsh toke again! My easy tip for smoother smoking :)
When closing your lips around the end of a joint, or the draw hole of a pipe, vape, etc., open your lips ever so slightly, in a way that there is a small gap to one side of the smoking implement.
This will make it so that when you inhale, you will be drawing in air as well as smoke. The air will cool and dilute the smoke, making it less harsh as it passes through your throat and lungs!
I discovered this because I'm sick. And my throat hurts. I figured, to not induce coughing fits, I could inspire myself from the air draw hole on my glass pipe. And it works great! Just like the draw hole on a pipe, you can adjust how much air you take in by adjusting the size of the hole. From a tiny pinhole off to the side (if you're smoking a thin joint that's harder to draw from) to a gap all around the end of, say, a fat joint or blunt that's making more than enough smoke for you, your lips barely touching it, drawing in mostly air. Play around to find how much air you like, and what lip position yields that.
Hope it helps!