it gives headaches cuz it takes longer to burn meaning u hold the liter there longer, hence u inhale more butane fumes which is what gives u a headache, as far as the resin goes u can scrape it or use my method, my way takes a while,, soak ur pice good in rubbing alchohol for atleast 6 hours, then empty out the rubbing alchohol onto like a plate or something flat that ur not gonna wanna use, then wait 2 or 3 days for the alchohol to evap, all ur resin will be on ur plate or w.e, then get a razer blade and scrape it off, or a pin or nething for that matter, ur not gonna get the plate clean ever again tho. also ur pipe will be clean so you can hit itbetter