I quit smoking tobacco a year ago and for the last 2 years I have combusted a bong daily about 16-40 bong loads a day of the best high quality medical cannabis around sometimes more and my lungs and overall health are currently better than ever, even when I vaped exclusively in the past. But I have changed my lifestyle in many ways and now keep active daily and workout. People who live with me or my close friends sometimes comment on how much I smoke and think it is crazy or must be bad for me but I simply know it is benefitting me greatly, even combusted, and with proper smoking technique(no butane, clean water pipe, proper sized hits) I have been able to smoke this heavily for years with no irritation.
I use my vapexhale cloud in the mix but have only taken two whole days to vaping exclusively in the last year. I would call this heavy smoking but I am sure my tolerance is lower than a lot of heavy vaporists or concentrate users. One thing I learned is if you have any slight guilt or insecurity each time you use(to appease non users, past influence from friends like being called "pothead" or "drug addict", etc) you are putting yourself in a self created negative cycle of guilt. I no longer try to limit my usage to 3 sessions a day like I did years ago(thinking using too much would cause me dependancy, addiction, money loss, so forth) now I use as much as i want no guilt and denounce anyone who disrespects or makes fun of my usage because I simply know now they are wrong. I am happier and healthier than ever, have more weed than ever, make more money than I ever have doing what I love, and more productive and social member of society, and smoke more grams of weed per day than is socially acceptable even to my stoner friends. So is that heavy usage? It's all relative, just do exactly what you feel like every day and let no one influence you! There is no such thing as heavy usage, whatever YOU feel like using per day is good and fine and that's that!