To dream that you are using marijuana, signifies illicit activity or ill health. If someone else is using marijuana or trying to get your to use it, then it indicates negative peer pressure or loss of control. You may feel that your identity and sense of self is being compromised or disrespected.
To see or smell marijuana in your dream, suggests that you are experiencing an expanded sense of awareness and consciousness. You need to take advantage and draw insight from this new consciousness. The dream may also mean that you need to look on your inner strength for stimulation instead of relying on outside forces.
This substance is now considered an illegal drug and as such it should be viewed that way in your dream interpretation. As a symbol, it stands for any activity that is not within the bounds of the law. It can also denote the fact of not being able to think clearly if you dream that you are smoking it, and this could cause you much trouble and stress. As an herb, it has curative powers, and for the older generation of dreamers who still think of this as an herb, this is a warning to have your health seen to by a professional.