Are there any known bad side effects or death from smoking marijuana?

Lung cancer & psych: Long-term effects of marijuana use include lung cancer (since marijuana smoking, like cigarette smoking, includes tar), dental problems, and the development/exacerbation of psychosis. On the short-term though, there is no significant mortality due to marijuana use and no deaths from marijuana overdose have ever been reported.

Yes and no: I am not aware of any deaths directly related, but there are likely associated deaths such as driving or operating machinery while under the influence. Like any chemical there are potential adverse effects and as mja is presently illegal federally and in most states, there is not much good quality research to even answer you adequately. Please ask congress to support appropriate research!

YES: In some ways, worse than smoking tobacco because you hold the smoke in the lungs. Addictive and long list of health problems that shorten lifespan.

Weed side effects: "smoked marijuana damages the brain, heart, lungs, and immune system. It impairs learning and interferes with memory, perception, and judgment. Smoked marijuana contains cancer-causing compounds and has been implicated in a high percentage of automobile crashes and workplace accidents.".