You can give an example of your friends, i can give an example of friends who started smoking pot and turned from bright and eager honor roll students to groggy, lazy burnouts. You can't paint a broad picture of how marijuana effects everyone. Like any other drug, the user's personality and chemical makeup play a large factor in how the drug will affect them. For example, many argue that pot is completely non-addictive, while many studies show severe physical and psychological effects of quitting a strong marijuana habit. I agree with you that you can not paint a broad picture of all marijuana users. That is why i used my friends as examples to prove the misconception wrong. As for being addictive, if marijuana really is physically addictive (which we don't know due to a lack of research), its effects have to be less than alcohol and probally tobacco as well. I do not buy into psychological addictions. Anything think can be psychological addictive, that has to do with the user not the drug