Make smoking pot illegal

I am not suggesting getting rid of pot. That has been proven impossible, but that SMELL... Also the long term issues associated to smoking is well known, kills millions of people. Why not make smoking pot illegal, but ingesting THC in other ways legal?
Have a brownie, or eat a cookie, or put it in a candy bar or something. Anything that doesn't cause second hand <anything>.
If smoking pot was illegal, it would be easy to relay to the police.. impossible to hide.. easy to ticket.