1. Marijuana Is Bad For Children --

Smoking can alter a person's DNA, causing mutations. These mutations can trigger serious illness, including cancer. These mutations can be passed to children and future generations, raising their risks too.

2. Marijuana Is Bad For Youth --

A study,published in the British Medical Journal, found that one in ten people who used cannabis before the age of 15 developed schizophrenia by the age of 26.This compared to three per cent of those teenagers who did not use the drug.

3. Marijuana Is Bad For Adults --

We’ve all heard the marijuana “gateway drug” theory when it comes to teens, and more and more evidence is emerging that supports it. But a new study shows that marijuana may be a gateway to drug and alcohol problems for adult users, too. In a study,Cannabis users were at significantly higher risk for developing drug and alcohol disorders by the time of the follow-up interview than those who did not report pot use in the initial interview.

4. Marijuana Is Bad For Habitual Users --

There's a new report out on longtime marijuana use from U.C. Davis. And it's bad news for habitual users. In summary: The report on marijuana use found that 52% of middle-class frequent users“experienced downward mobility” compared to only 14% of non-users. “Regular long-term users,” Professor Cerda stated, “also had more antisocial behaviors at work, such as stealing money or lying to get a job, and experienced more relationship problems, such as intimate partner violence and controlling abuse.”