That's nice of you, your friend is lucky
The good thing with joints, too, is that he can stop smoking when he has enough...
But usually, after the first hits, you start to relax thanks to the harmalas+DMT in lower quantity at first, and then you get confident and finish the joint
Let me tell you about my last relevant changa experience
I rolled a joint with some 70mg changa (caapi+harmaline+DMT), turned the lights off, lit 2 small candles and put some icaros from the Huni Kui tribe in Brazil on the loudspeakers.
I started meditating and lit the joint. When it was finished, I wasn't even near where I wanted to be... So I felt the calling deep inside me...
"Get up, grab that GVG, and smoooooalk iiiiiit !!!"
My ego said "noooo, no no no no no, please !", but the Voice insisted...
I knew I had no choice but to obey Myself. So I did. (you have to know my DMT pipes are always preloaded, just in case
)
25mg of DMT later... Not even the Dome, or any tunnel, but instant teleportation into elfspace...
While *I* am enjoying the view, *I* observe that my ego is entering into a panick state... *I* watch, amused, the fight my ego is having with Fear, until the panic overwhelms my ego and uncenters Me...
The mareacion (nausea from Ayahuasca) is taking over my body to expulse the Fear that took over the ego, so I quickly get up (yeah, you can do that with changa, just like Ayahuasca, the harmalines ground you), grab my bucket and dry purge for a few instants until my abdos ache...
At that point, I really felt the message "ok, he fought enough, good boy, now you rest your soul and enjoy". Then I realized the icaros were still going on in the background (couldn't hear them in hyperspace) and that I had left hyperspace (visions now turned from strange patterns and machines to organic kaleidoscopes, colors changed from electric red and silver to green/blue with pastel tones...)
That's when I received some teachings about forgiveness, love and humility by who I perceived as the Spirit of Mother Ayahuasca, and eventually the visions turned to serpents and vines while I was blessed with pure Love in my heart... I'm crying of joy as I remember this now...
So thank you for giving me the opportunity to reconnect with that moment !
That moment lasted an hour in this reality, btw, and you can expect the same with 150mg in a joint. I'd say 45 minutes with 100mg.