My sister had a Sony TV here a few years ago that died and she asked if I would look at it. I unplugged it and removed back cover and I could not believe the amount of black tar inside that tv. My sister smokes by the way. So, yes, that gunk inside your projector is due to smoking. I told my sister, after she saw the inside of her tv, that imagine what her lungs look like but she continues to smoke.
JVC RS600(Fantastically calibrated by ChadB), Stewart Cima Neve 2.35 115" diagonal screen, Darbee Darblet, Denon AVR-X7200WA(7.6.4), M&K Speakers, 6 ported 18" subs powered by 3 inuke 6000dsps, Roku 4, Oppo BDP-93 blu-ray player Panasonic UB-900 UHD blu-ray player