But a lot of stuff says they smoked tobacco. The fact that you have nothing which says they smoked weed, demonstrates that it is unlikely that they did so, for they obviously thought there was no reason why people shouldn't know they smoked tobacco. If weed was also so regarded, there should be the same proof available as there is for tobacco.
The fact that there is not, argues against it.
But I understand your panic. Because if the Founders smoked weed and created the Constitution, the planet would crack in half.
Well I can understand that too, because it would mean that time and history have been warped by some force never before encountered by mankind. More like the Universe would crack in half due to all the quantum juxtaposition going on. The cat would be both dead and alive at the same time.
Well as I said elsewhere, we know they grew it, harvested it, dried it, sold it, sometimes separated the plants by sex (and the plant's strengthing requirements haven't changed since 1790), sold it, and generally had it around. We also know they did the same exact thing with tobacco, but smoked the tobacco instead of turning the bulk of it into rope. And finally, we know that weed had been smoked to get high for thousands of years, and so it's likely they knew it had that capability.
So there's a little bit more balancing out this equation of potential smoking than you're admitting, But hey, if given all of that, you still believe they didn't smoke it - these men who smoked tobacco every day and drank alcohol far more than people do today - then Bless Your Heart.