Marijuana is also called as cannabis and it is a preparation of cannabis plant and it is used as a psychoactive drug or medicine. Characteristics of Cannabis were studied to determine the suitable and efficient environmental conditions for its indoor mass cultivation for pharmaceutical studies. Effect of different photosynthetic photon flux densities,temperature and CO2 concentrations on gas and water vapour exchange characteristics of the Cannabis. The rate of photosynthesis and water use efficiency of Cannabis increases with photosynthetic photon flux densities at lower temperatures. Genrally the photosynthetic process will occur by taking the carbondioxide and water and in the presence of sunlight and chlorophyll it forms the glucose and oxygen and from the glucose the plant makes the cellulose which gives the fibrous structures to the plant. The osmosis process helps in the absorbption of water and minerals from soil. The osmotic pressure mainly helpful in intake and transport of minerals and the soil condition also plays an important role. Cannabis gives its potential for better survival,growth and productivity in drier and CO2 rich environment. Solution Marijuana is also called as cannabis and it is a preparation of cannabis plant and it is used as a psychoactive drug or medicine. Characteristics of Cannabis were studied to determine the suitable and efficient environmental conditions for its indoor mass cultivation for pharmaceutical studies. Effect of different photosynthetic photon flux densities,temperature and CO2 concentrations on gas and water vapour exchange characteristics of the Cannabis. The rate of photosynthesis and water use efficiency of Cannabis increases with photosynthetic photon flux densities at lower temperatures. Genrally the photosynthetic process will occur by taking the carbondioxide and water and in the presence of sunlight and chlorophyll it forms the glucose and oxygen and from the glucose the plant makes the cellulose which gives the fibrous structures to the plant. The osmosis process helps in the absorbption of water and minerals from soil. The osmotic pressure mainly helpful in intake and transport of minerals and the soil condition also plays an important role. Cannabis gives its potential for better survival,growth and productivity in drier and CO2 rich environment..