Marijuana is consumed - mainly - in 2 ways and the 2 ways do lead to quite different experiences. The first way - from Latin culture - consist in smoking hashish or weed mixed with tobacco.
Lester Grinspoon a Psychiatry professor who in the 1960s began studying Marijuana and did write the two most important books on Marijuana ... Marijuana Reconsidered and ... Marijuana The Forbidden Medicine. Here he describes his "First Experience Smoking Pure Cannabis" - remember that in the United States Marijuana is used PURE and not mixed with Tobacco.