Compared to other drugs effect to an individual mental and physical condition, marijuana is not so dangerous to the one using it. The medicinal substance composition of it lessens the bad effect on the human organs and body structure. Cigarette smoking and addiction to liquors are more dangerous to humans as compare to marijuana.  Side-Effects of Marijuana The following are side effects of marijuana on a person using it. The first time an individual smokes marijuana he can feel a sigh of ...