I've never teared up unless I'd be smoking a super fat joint/blunt with my mate and I'll be coughing so hard after a few hard hits that my eyes will tear up but that's it.

And when I smoke outta a bong or a pipe ya I push the black ashes outta the way to get hits of green because I don't like smoking ash or the black stuff in the bowl I try to hit green everytime. And that's what everyone I've grown up smoking with has done so it's normal to me..