Does marijuana have a long term effect or short term effect?

Short-term effects of marijuana include:
altered senses (for example, seeing brighter colors)altered sense of timechanges in moodimpaired body movementdifficulty with thinking and problem-solvingimpaired memoryhallucinations (when taken in high doses)delusions (when taken in high doses)psychosis (when taken in high doses) 
long-term effects of marijuana include:
-decline in general knowledge and in verbal ability 
-loss of mental abilities 
-may impair thinking,memory and learning functions and affect how the brain builds connections between the areas necessary for these functions.