well actually the comparison of weed was made off of weed that had been sitting in an evidence room for 30 year and its smokeing level was below 0.5. the thc on it was sooo decompossed u wud have to have smoked about a pound of that shit to get a buzz, also marijuana was outlawed because of it threat hemp posed on the pulp, gasoline and cloth companys. the statement of marijuana having three times more tar and five times more carbon monoxide was biased, the smoke the ciggarettes filtered , and the marijuana un-filtered. the fact that marijuana causes brain atrophy etc. was been proven wrong, the scientist who said that basicly hotboxed rhesus monkeys for five minutes with about as much smoke as a heav toker wud smoke theyre whole life and did this several times a day. grass is an amazin documentary, but i say if the government is going to inform u, they shud make sure its the truth.