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eating bananas will give you superpowers or nothing at all

Alchemist. 
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and not everyone get affected in the same way, there are some varieties and there some many factors to take into account, there is some science there to be studied.. this is not a random thing 

but ambition is not in the mix.. drugs like cannabis don't affect this way.. this is not heroine.. then we can talk about ambition going down but this is mainly because you are flying on another "place".. but I would say that there is "will suppression" with heroine and derivatives.. but this is not happening with cannabis (and never tried heroine, just in case)

does a tea has something to do with ambition?

and, cannabis has nothing to do with ambition..
people's ambition does not get modified by cannabis..

what he is observing is people under the effects of cannabis acting "lazy" I guess.. (aka not ambition, but this is short term, not applicable for ambition definition)..something that only happens with a variety of cannabis.. "cannabis indicae"

in the other hand, "others" that when are under effects of cannabis can focus and excel in their task.. in a crazy way (or he is talking about crazy people..? and missunderstood that), anyway, this happens to everyone under cannabis effect, they can focus.. but those who have ambition..those are using that focus capabilities.. to excel in their tasks.. (that said, cannabis sativa can increase cerebral activity)

or something like that, open to discussion