A stoner told me that there’s no proof that marijuana is bad for you, what do I say to this?

You missed your opportunity. Don't bring up the past. It is history.

drinking caffeine is worse for you if you didn’t know. Drinking alcohol is 100 times worse not saying I don’t drink but **** even nicotine is 10times worse and all this is legal for us to have. LoL marijuana is the least of are worries

Nothing. Walk away. Why do you need to have a discussion?

It is easy to believe there is no proof when you aren't looking for it. There has been evidence for years that it is implicated in schizophrenia, amotivational syndrome, and male-line birth defects. And anyone who thinks smoking it is without effects is just plain stupid, as I could figure out as a child around a camp fire, that it isn't good for us to get smoke in our lungs.

What is wrong with people? Thumbing individuals down for saying that it is bad for you. Be honest "POTHEAD", "STONER" are terms used for someone constantly high and/or addicted to it so you should not listen to them. They will justify what they do because they do not want to stop... They say stuff like "its from the ground, god put this here" etc etc... Anything can become addictive or bad for you. If you over eat thats bad for your health so come on but anyway i constantly invest within the industry and think others should as well... It is room for alot of growth. Here is a site that discuss ways to possible profit from the industry https://motivatedjay.com/blog/f/ways-to-profit-fro...

Google it! There are lots of side effects. Breathing hot smoke into your lungs is harmful regardless of the source.

Cite documented statistics on the increase in traffic deaths from driving under the influence. Also, cite the OSHA regulations that prohibit any amount of THC in the blood while on the job - this one will put a lot of people out of jobs and open up positions for those who need to work.

Tell him , it is! He's a stoner dude, of course he'll say that!!

Tell the stoner to do some research

You say “then why does your face look like that?”