All drugs are different. The point is to get past the mentality that substances can be evil in themselves, and to critically evaluate the effects of potentially harmful substances rather than lumping them all into one category of "bad drugs". The same principle holds whether you include cannabis in the bad drugs category or not. Anybody provided with truthful, non-biased information about drugs will quickly realize that cannabis is not nearly as dangerous as other substances can be. We don't need to determine for other people what drugs are good and what drugs aren't; everybody is capable of drawing their own conclusions, and those differing conclusions need to be tolerated if we want to respect freedom of expression. Why filter the available information based on our own opinions? Whose opinions on what drugs are okay should determine what gets censored?