Smoking is an activity that an unfortunately large segment of the global population tends to willingly take part in at this current point in time. Much of the damage they are doing is to their own lungs, and while you are fully within your rights to do whatever you want to the lungs that are in a body that belongs to nobody but yourself, suffice it to say that you should still do a few things here or there to make it so that the damage your preferences are doing won’t be as significant as they might have otherwise ended up being.
One thing that you can do if you are a smoker that is not planning to quit any time soon is regular vent cleaning. Since you are already placing so much strain on your body’s natural breathing apparatus, you would do well to reduce further strain that would be put on it through other sources such as dirty air vents. The key to cleaning out your air ducts is to use negative pressure without a shadow of a doubt, since this would remove almost everything either solid or liquid that was inside of them.
As a result of the fact that this is the case, your air duct cleaning should start off with negative pressure, after which you can use a variety of other methods. You should consider removing large debris before using negative pressure techniques though. Extremely large chunks of debris can get knocked around your air vents thereby damaging them and potentially even poking a few holes in them, so it helps to remove this debris well beforehand so that you don’t have to go through that.