Long-Term Effects: Marijuana affects brain development. If you begin to use Marijuana as a tenneager the drug might impair your thinking and your memory. Those who use Marijuana show a significant decline in general knowledge and verbal ability. The lost mental abilities you lose if you smoke marijuana as a teen do not fully return to you as an adult, even if you stop smoking marijuana.

Physical effects: Marijuana may cause Breathing problems-marijuana irritates the lungs and people who smoke marijuana frequently can have the same breathing problems as someone who smokes tobacco. Increased heart rate- Marijuana raises your heart rate up to 3 hours after smoking it. This effect increases the chance of having a heart attack. Problems with child development during pregnancy- Marijuana use is linked to a lower birth weight and an increases risk in brain and behavioral problems in babies.