Nurses are awesome and I salute you!
I'm very sorry for your respiratory problems (if I read that right). However, you're a nurse,. You don't know everything through your profession. You keep doctors from killing patients and making sure the patient is comfortable. Without having consumed cannabis, however, you're not really in a position to gauge whether it's healthy or not healthy for you. Conventional wisdom says that, yes, smoking marijuana is hazardous to your health and you'd be correct. Smoking cannabis is the least healthy way for you to consume it. All that hot smoke filling your lungs stinging as it goes down forcing you to cough...yeah, seems pretty unhealthy. But, that's the extent of it. There's no metals, no carcinogens, just irritation and scalding.
Sure, there are those susceptible to forms of respiratory illnesses like COPD, emphysema, asthma or whatever else there is but by and large, they're predisposed to having those conditions from a wide number of environmental and personal factors.
You have ailments. That doesn't mean it was caused by any one thing and that others shouldn't be allowed to do something you're sensitive to. I'm trying to eat a little better because I'm obese and have elevated blood pressure. I'm not going to scold someone for eating at McDonalds because I'm on a diet. So too, you shouldn't be complaining that others are smoking marijuana for either its medicinal effects, its recreational effects or some combination of the two.