From Live Science:A lot of studies have shown marijuana is not good for you. It can fry the brain and contribute to psychosis. The latest one finds "convincing evidence" that marijuana smoke damages the genetic material DNA in ways that could increase the risk of cancer.
Toxic substances in tobacco smoke can damage DNA and increase the risk of lung and other cancers. However, there has been uncertainty over whether marijuana smoke has the same effect.
Scientists are especially concerned about the toxicity of acetaldehyde, present in both tobacco and marijuana. However, it has been difficult to measure DNA damage from acetaldehyde with conventional tests.
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