I have never smoked cannabis with 25i, although I might try it once.   
  
I have only done it 3 times over a period of maybe 6 months, and I only use blotters(I hear that people OD all the time doing the powder form of it).  I had a bad trip where I through up and became really paranoid, and so I decided to lay off of it for a bit.  I find that it makes my body feel gross (like I'm sick, but not nauseous, just sick).  My friend suggested that I take a tab, relax for a bit, and then smoke a square.  I might try that.   The most that I have ever done is 1 tab, and I think that I'm fine with only doing a half tab.  Last time I did it I was in my friend's basement and we turned on some Pink Floyd and looked at videos of the aurora borealis on his TV while all the lights were off, and I must say, it was quite the bliss.  I might try smoking some cannabis next time I do it.  If I do, I'll report back to you