depends on how you want to smoke it. Lets assume you are smoking a joint(a marijuana cigarette, also known as doobie). You put the tip in your mouth, you light it at the end, and you breathe it in. Don't try to suck really hard. In fact, pretend it isn't there and take a deep, slow breath with your mouth.
The same applies if you smoke out of a pipe or bong. However, if you smoke out of a bong, keep the edge of your lips on the part you suck out of, you don't want any space between your mouth and the bong. [ TheWallflower's advice column | Ask TheWallflower A Question ]
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