I tend to smoke heavier smokes and thought the F had some nice spice but didn't seem to be overwhelming strong. Last one I smoked was at a herf following a Tat Red Tubo and Liga 9 Beli so maybe that's why I wasn't effected by it. There aren't too many sticks that I have had lately that have had me filling ill. The last stick I had that I thought was a super spice bomb was the Liga Flying Pig though. Not enough to make me sick but enough for me to stop from time to time and say, "Wow, that's a strong stick." May not make him ill but if you get him to smoke on an empty stomach it may be the one to do the trick. Either that of the LFD Oscuro Especial on an empty stomach. That stick did it to me a few years back but I blame myself for smoking a spicy stick of that size without anything to eat. When I did finally eat it was not pretty.
Good luck!