[quote=@pyroman]
[@Loony] Now I'm curious to how Gems would react to things like cigarettes and cigars and such. I don't think that they could be effected by it, since holograms and lack of organs, but it's given me something to think.
[/quote]

They would be fine,a gems body is only an illusion that's why they can shapeshift,so if they got infected with a disease,there wouldn't be anything to infect because their bodies are merely tangible illusions.