im assuming you are talking about the use of teas and such...?
they wouldnt make as much dollers is why it didnt make sence, they whol hydro craze would blow over in less then a year.
the book weed was very good. i liked most, beside the good writting, was the included detail of mexico as a whole. you could almost tatse the food and smell dirt roads when reading his passages. the story took me deep into the mountains of central mexico. riding mules on immposible trails, federales, bandidos, and customs.
he starts out talking about how he got busted at the border. the main focus of the book however, was detaild around a story he was doing for life magazine in the mid 70's. they wanted to know about smuggling marijuana. i guess he though what better way to show them but to document a an actual run.
what they didnt count on was not being able to take pictures of the fields once they got there, the farmers said no way. one for farmer, fortunatly, said if they bought the feild they can do what they please!