Marijuana is used in one of three ways. The most common method of use is to roll the leaves in paper and smoke it like a cigarette. The second most common method of use is to smoke the marijuana through a pipe.
Pipes come in a variety of sizes and styles, but the method of smoking is still generally the same.
The third method of use is the least common. Occasionally people will simply ingest the marijuana by combining it with food. The THC in marijuana is believed to change a psychoactive compound in the liver, which may be the cause of the psychological and subjective effects. The psychological effects of marijuana are most often seen in altered perceptions of distance and time, impaired memory and physical coordination, and a heightened sensitivity of the visual and auditory senses. The subjective effects refer to those effects that are going to change from person to person.