. >> joel vargas started smoking when he was just 13.y 15 he was smoking more than a dozen times a day. he stopped skateboarding. he even dropped out of school. >> i like getting high. i need to get high because my brain is telling me. >> adolescents, starting about age 13 have a pretty mature brain reward center. so they can experience rewards and pleasures the same way adults can, but the problem with that is that their prefrontal cortex, which helps people think ahead, control their impulses, that's not fully developed until age 24. that explains why adolescents are much more vulnerable. >> there's something else that addiction experts believe is likely happening in the brain. when you smoke pot, the feel-good chemicals that make up marijuana called cannabinoids, remember them? they cause your brain to stop producing its own natural cannabinoids. when you stop smoking, you have no feel good cannabinoids of your own. until your body kick starts production, you feel lousy, so many people smoke again to feel better. and today's marijuana

. >> joel vargas started smoking when he was just 13.was smoking more than a dozen times a day. he stopped skateboarding. he even dropped out of school. >> i like getting high. i need to get high because my brain is telling me. >> adolescents, starting about age 13 have a pretty mature brain reward center. so they can experience rewards and pleasures the same way adults can, but the problem with that is that their prefrontal cortex, which helps people think ahead, control their impulses, that's not fully developed until age 24. that explains why adolescents are much more vulnerable. >> there's something else that addiction experts believe is likely happening in the brain. when you smoke pot, the feel-good chemicals that make up marijuana called cannabinoids, remember them? they cause your brain to stop producing its own natural cannabinoids. when you stop smoking, you have no feel good cannabinoids of your own. until your body kick starts production, you feel lousy, so many people smoke again to feel better. and today's marijuana could b

. >> joel vargas started smoking when he was just 13.he was smoking more than a dozen times a day. he stopped skateboarding. he even dropped out of school. >> i like getting high. i need to get high because my brain is telling me. >> adolescents, starting about age 13 have a pretty mature brain reward center. so they can experience rewards and pleasures the same way adults can, but the problem with that is that their prefrontal cortex, which helps people think ahead, control their impulses, that's not fully developed until age 24. that explains why adolescents are much more vulnerable. >> there's something else that addiction experts believe is likely happening in the brain. when you smoke pot, the feel-good chemicals that make up marijuana called cannabinoids, remember them? they cause your brain to stop producing its own natural cannabinoids. when you stop smoking, you have no feel good cannabinoids of your own. until your body kick starts production, you feel lousy, so many people smoke again to feel better. and today's marijuana coul

. >> joel vargas started smoking when he was just 13.y 15 he was smoking more than a dozen times a day. he stopped skateboarding. he even dropped out of school. >> i like getting high. i need to get high because my brain is telling me. >> adolescents, starting about age 13 have a pretty mature brain reward center. so they can experience rewards and pleasures the same way adults can, but the problem with that is that their prefrontal cortex, which helps people think ahead, control their impulses, that's not fully developed until age 24. that explains why adolescents are much more vulnerable. >> there's something else that addiction experts believe is likely happening in the brain. when you smoke pot, the feel-good chemicals that make up marijuana called cannabinoids, remember them? they cause your brain to stop producing its own natural cannabinoids. when you stop smoking, you have no feel good cannabinoids of your own. until your body kick starts production, you feel lousy, so many people smoke again to feel better. and today's marijuana

. >> joel vargas started smoking when he was just 13.15 he was smoking more than a dozen times a day. he stopped skateboarding. he even dropped out of school. >> i like getting high. i need to get high because my brain is telling me. >> adolescents, starting about age 13 have a pretty mature brain reward center. so they can experience rewards and pleasures the same way adults can, but the problem with that is that their prefrontal cortex, which helps people think ahead, control their impulses, that's not fully developed until age 24. that explains why adolescents are much more vulnerable. >> there's something else that addiction experts believe is likely happening in the brain. when you smoke pot, the feel-good chemicals that make up marijuana called cannabinoids, remember them? they cause your brain to stop producing its own natural cannabinoids. when you stop smoking, you have no feel good cannabinoids of your own. until your body kick starts production, you feel lousy, so many people smoke again to feel better. and today's marijuana c

. >> it happened to joel vargas. f years of smoking daily, joel eventually ended up in rehab where he faced mild withdrawal symptoms like irittability, insomnia, nausea. >> certainly it isn't anything nearly as dangerous as bankrupt discontinuation of alcohol. you know, for somebody like joel, going rehab is really about learning new behaviors more than it is about sort of treating the physiological dependence or tolerance or withdrawal issues. >> joel has been clean now for six months, but these kinds of risks, they don't scare off charlotte's parents. >> people ask us that a lot. like, how do you make that decision? it wasn't a decision -- it was the mechanics viable option. >> some would say a radical option. marijuana for a 5-year-old, but it was an option they hoped would change her life forever. >> when we come back, matt and paige finally give their charlotte marijuana. the results are shocking. [ male announcer ] these days, a small business can save by sharing. like carpools... polly wants to know if we can p

. >> it happened to joel vargas. years of smoking daily, joel eventually ended up in rehab where he faced mild withdrawal symptoms like irritability, insomnia, nausea. >> certainly it isn't anything nearly as dangerous as bankrupt discontinuation of alcohol. you know, for somebody like joel, going rehab is really about learning new behaviors more than it is about sort of treating the physiological dependence or tolerance or withdrawal issues. >> joel has been clean now for six months, but these kinds of risks, they don't scare off charlotte's parents. >> people ask us that a lot. like, how do you make that decision? it wasn't a decision. it was the next viable option. >> and some would say a radical option, marijuana for a 5-year-old. but it was an option they hope would change her life forever. >> baby. >> when we come back, matt and paige figge finally give their charlotte marijuana. the results are shocking. at farmers we make you smarter about insurance, because what you dont know can hurt you. what if you didn't