The report notes that a couple of small studies appear to confirm the suspicion that cannabis use on a regular basis is dangerous for the lungs. It notes:
[a] study of 10 patients who were treated for chronic respiratory problems at the Alfred Hospital in Melbourne.All admitted intense cannabis use for at least a year. They had developed bullous lung disease, a condition where air becomes trapped in the lungs, at an average age of 41, compared to 65 for tobacco smoking patients.
While we are talking drugs, I note that the rumours of Heath Ledger being a significant drug user are appearing more and more likely to be true. I had forgotten how oddly he had acted in some interviews in recent years, but somewhere since he died I saw a snippet of the studio interview in Australia throughout which he peeled an orange. I have heard mention again, too, of how he turned up to some media things in the States dressed looking like he had been living rough on the streets.
All this supports my scepticism of the often repeated claim that many regular illicit drug users have a well hidden habit which would surprise their co-workers and friends.
It is, I reckon, more often the case their friends and family certainly notice strange behaviour, and do suspect drug use, but are too polite to bring it up.