I've been doing some experimenting with mushroom tolerance and my findings have been quite different from the data displayed on the graph. Basically, I've found consistently that there's no lessened effects from taking mushrooms two days in a row; in fact, my experience has been almost the exact opposite. I have found that when I trip on mushrooms two days in a row, the second trip is usually the stronger one without any substantial increase in dosage.
So here's my story: I've taken mushrooms six times and LSD once in the course of the previous two months. Four of those instances were me taking mushrooms on back-to-back days. My previous experience with psychedelic substances includes extensive exploration of mushrooms, DMT, mescaline, LSA, LSD, cannabis, and salvia divinorum over the past 3-4 years.
1. 17-Sep - Dosed 3.5g dried cubensis mushrooms. Went to the beach. Reached only about a ++, never really got overwhelmed by the experience. Time becomes inconsistent, some wavy visuals, displacement into childhood memories, empathy, dissociation, anxiety. Not much euphoria, until finally "the horizon takes me in, and the infinity of space wraps around me; I look into the sky and see a fractal "deity" in the clouds, and I begin talking to myself in a voice that soon becomes not-mine, takes over my thoughts and speaks for me. He says, "We're always here...whether you orient yourself properly to see us or not--that is your choice." And I knew what he shrooms were trying to tell me all night." (taken from trip journal) But the trip wasn't a full-blown psychedelic experience, I was only able to channel that message because of my familiarity with the substance. The trip never really "launched off" as I like to say.
2. NEXT DAY: 18-Sep - I take another 3.5g dried cubensis. I was worried that my tolerance from the previous day would lessen the trip so this time I grind up the mushrooms and place them in lemon juice for a few minutes before drinking them down in one gulp. Everyone of course knows that this method has been shown to intensify the mushroom experience by up to 3.5x. But all that aside, whether it was largely the result of the lemon tek or not, the tolerance from the previous day did not weigh down the trip at all. I had an insane +++ trip bordering on a ++++. First I got closed-eye geometric patterns, then arrived at a DMT-like shifting vortex sensorium, crazy characters in my head (my spine becomes a constantly-rotating barbershop pole alternating face and hands instead of red/white stripes), waves of color, and giddy euphoric giggling/laughing, things glow and move, music explodes, thoughts dance and skee-daddle in my head.
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3. 23-Oct - I drop 3 tabs of acid (two fairly weak, one really strong) and one pill of an unknown amount of MDMA at a rave. I have an insanely awesome +++ trip, dancing, euphoria, wild visual hallucination, etc. etc.
4. 30-Oct - Dose 1.5g dried psilocybe cubensis mushroom. Just eat them down straight. I go to a party and have a really good time. No anxious come up (typical for me on shrooms). Just a great body-high, euphoria and slight waves/vibrations in my visual perception. Perfect for a mellow house party. The trip is about a + or even less perhaps.
5. NEXT DAY 31-Oct - Dose 2.0g dried psilocybe cubensis mushroom (same batch). This is the most unexpected result. This time, I wanted to see what the tolerance issue would amount to if I used the same administration method as the day before. So I just gobbled the shrooms down plain. And let me tell you, the tolerance might as well have been REVERSE TOLERANCE. I'm not saying that's what it was, but I only upped the dose by 33% (that's 133% of my previous dose) and I had a +++ trip bordering on a ++++. Went to a dance party and felt like I was lost in the flow of reality, bordering on ego death at times. Shifting colors and strong wavy OEV, crazy strong CEV, euphoria, empathy, time dilation, insight, paradoxical feeling of normalcy and total alteration, etc.
In conclusion, I have not found that tolerance hampers next-day tripping with psilocybe cubensis mushrooms. I have consistently had better experiences on the second day when I had taken them the previous day.
Usually there is less anxiety and a better, stronger peak.
Even if my findings are just an anomaly and I am an exception to the rule, I recommend that if you want to take mushrooms two days in a row, you administer the first day's dose by just eating the mushrooms straight; then, on the second day, dose the same amount ground up in lemon juice (lemon tek) and I can almost guarantee you will have a trip at least as strong as the previous if not stronger.
So don't let all this tolerance talk worry you--it can still be done.