Yes it does, what a lot of people who smoke do not recognize are the serious side effects that come from smoking at a younger age, or an age when the brain is still under development, I strongly urge people who do smoke to wait until they are at least over 21 to use it occasionally. If you are a chronic user and under this age there can be serious side effects ahead for you. What many people think is that cannabis is healthy for you, it does have many beneficial side effects but when people advocate to do it everyday they see this as the norm and tend to think, "if herp is doing it everyday and has no health problems then I can too!" this is unfortunately not the case since everyone is different. My message to fellow ents: if you wish to consume cannabis please check with a doctor first before making your own decisions on which drugs to use.