I think its mainly because tobacco companies acted in many ways very wrong. For example: - denying any link between smoking and lung cancer. - added stuff to t

I think its mainly because tobacco companies acted in many ways very wrong. For example: - denying any link between smoking and lung cancer. - added stuff to tobacco that might probably increased addiction - etc. There have been several "waves" of lawsuits since the mid fifties. Here is a nice comprehensive overview: http://publichealthlawcenter.org/topics/tobacco-control/tobacco-control-litigation http://publichealthlawcenter.org/topics/tobacco-control/toba... The marijuana companies will probably get the same problems if they continue the path of tobacco companies. Greets, Chris