Short-term effects of using marijuana include:

• Sleepiness
• Difficulty keeping track of time, impaired or reduced short-term memory
• Reduced ability to perform tasks requiring concentration and coordination, such as driving a car
• Increased heart rate
• Potential cardiac dangers for those with preexisting heart disease
• Bloodshot eyes
• Dry mouth and throat
• Decreased social inhibitions
• Paranoia, hallucinations

• Enhanced cancer risk
• Decrease in testosterone levels and lower sperm counts for men
• Increase in testosterone levels for women and increased risk of infertility
• Diminished or extinguished sexual pleasure
• Psychological dependence requiring more of the drug to get the same effect