I had to stop because the best way to smoke, is to do it often in small amounts, but this inevitably creates a lingering smell. This is understandable but there are no alternatives to go outside either. On top of this, the stigma is still there, and non-smokers despise smokers and can't stand even smelling a particle in the air without making strange faces and throwing dirty looks.
I still have hopes it becomes like coffee, because if done properly, it stimulates productivity, it's just that most overdose (and have extreme low tolerance from non-frequent use), so they end up thinking weed makes you lazy and puts you to sleep, which is not the case if you know what you are doing.