So then we should probably talk about car exhaust fumes, I inhale that every time I go outside unsolicited. What about people who are sick? They should probably be banned from public spaces too. And restaurants who cook with grease, you inhale that when you walk past them too.

A smoker smoking a J in a designated smoking area is literally not causing any more harm than any other person smoking in that area. Designated smoking areas exist for a reason. People smoke in society, its simply how it is. People are exposed to harmful substances in the form of gas and fumes every single day of their lives from a million different sources. Singling out people smoking weed is stupid and largely driven by misinformation.