Choose to be a healthier teen, friend, sibling, version of yourself. MOST YOUTH DON’T USEMOST teens (8 out of 10) in Maine do NOT use marijuana. And, MOST teens are concerned about their friends using marijuana. Protect Your Developing Brain Your brain isn’t fully developed until age 25, or 26 if you’re a male. Your teenage brain is building connections. Marijuana can get in the way of that construction. watch how this happens Natural Doesn’t Always Mean Healthy Regular cannabis use can affect memory, motivation, mental health and learning. It also can worsen asthma and cause other physical problems. learn more about the effects of marijuana