Marijuana / Cannabis

Teens who use cannabis are more likely to quit school or fail to obtain a degree, which can limit their future opportunities. Moreover, early youth marijuana use is associated with an increased risk of depression and suicidal behavior. 
 

Smoking cannabis can leave up to four times the amount of tar in the lungs compared to cigarettes, posing significant risks to respiratory health. Something else teenagers may not consider is that secondhand cannabis smoke can lead to a positive drug test.