Another thing that weed is safer than: espresso.  Proof on this comes from Britain:

Jasmine Willis, 17, developed a fever and began hyperventilating after drinking seven double espressos while working at her family’s sandwich shop.

The student, of Stanley, County Durham, was taken to the University Hospital of North Durham, where doctors confirmed she had overdosed on caffeine.  She has since made a full recovery and is now warning others about the dangers of excessive coffee drinking.

Ms Willis, who had thought the coffees were single measures, said the effects were so severe that she began laughing and crying for no reason while serving customers at the shop. […]

The teenager, who was allowed home after a few hours of observation, suffered side effects for days afterwards and now says she cannot stand the sight of coffee.

Try taking seven bong hits in a row & see if anything happens to you other than dozing off.