Making it hard to Breath for the Fun of it

Queening or Kinging
Okay, so I don't know if Kinging is the proper term but it is the one I'm going to use because I like it. Queening is basically when a woman smothers a person by pressing her sex into their face so that they can't breath. Kinging is basically when a man uses his sex to keep a woman from breathing as he pinches her nose closed somehow. I think it is fun to wear a harness with a dildo and use that method of domination myself. Obviously you could smother people with other body parts too, but I won't go into every part you could use. The risks are all about the same. If anything is in a person's mouth that could spark a gag reflex I think it is important not to insert it too deep or someone could throw up and inhale their own vomit. Many of us have faced that fear even when we weren't doing breath control..haha. If you are sitting on someone's face it is really important to have some nonverbal signals since you may not notice if they faint.

Gasmasks or Hoods
I love these. They are some of my personal favorites but they are a tad riskier than the options I mentioned earlier. You can put the bottom in a gasmask (my favorite is the Israeli style) and cover the air inlet. If you are really creative you can attach a tube to the air inlet and cut the air off by placing the tube opening against the body of the Top or bottom. It is hard to describe how delicious it is to be gasping from lack of air and have the tube placed against one of my nipples so that I am literally sucking on it with each gasp. Be very familiar with the gasmask and how to get it off quick if the bottom vomits from lack of oxygen. In the case of hoods, the first thing I would mention is that you need some way to monitor the bottom's state while they are in it. Depending on what style hood you are using you will need to adjust your play style accordingly. I recommend a hood with a mouth opening that you can cover so that it could be open if the person gets sick. If you choose to use some kind of discipline hood that uses tubes in the nose and mouth of your bottom you may want to be especially careful that if your bottom passes out the tubes won't get jammed into them too far if they fall. It is also important that you can remove the hood fast if the need arises. As much as I love inflatable hoods they are slow to remove and I think them poorly suited for breath control play. When you restore breathing to your bottom it is important that you make sure there is nothing in the air that may hinder their breathing or harm them to inhale through the tubes. I've inhaled latex polish and baby powder and I can tell you it isn't fun.

Bags/Plastic wrap
The main things to keep in mind are all pretty obvious. Remove the bag or plastic if the person faints. I would recommend that the material be held in place by hand. If you opt for another way of holding it in place try to avoid any pressure to the larynx.

Rebreathing bladders
These are usually attached to gasmasks or hoods. If you use them that way see my comments above. If you use these with tubes or something just remember to make sure the tubes don't go too far down the bottom's throat or up their nose.

Pressure on the Trachea and/or Hanging
This form of play requires a lot of caution. If you are somehow compressing the trachea it is important to do so by slowly applying pressure and making sure not to apply pressure to the larynx. One method is to take a curved finger and place it at the part of the throat where it meets the chin and pushing up and back slowly. Another method is to apply pressure below the larynx (sometimes with a scarf). A lot of injuries can occur to the trachea this way if you press too hard. If you are going to use a ligature or noose it is safer if you use one that doesn't constrict. If it does, make sure it is wide and padded. If it is too narrow it will cut or twist the skin causing bruising and damage to things such as blood vessels, nerves, the cervical spine, and the windpipe. It may also be a good idea to use a dry lubricant such as baby powder and a soft type of rope or ligature. If you are hanging someone it is important never to drop them into place. That could break their spine. I think a really nice form of rigging for hanging is when a person is raised into place with their feet still on the ground. If you decide to try airwalking there is a significant possibility of damage to the spine.

Compression of the chest
I like to simply have a lover lay on me and make it impossible for me to breathe. I'm rather teeny so if I have a big partner they can accomplish this pretty easy. Another form of chest compression is corseting. I can personally attest to how wonderfully hot it is to barely be able to breath in when wearing one. If you pursue corseting you should do some research on that particular topic. However you compress the chest you need to go slowly and carefully. It would be easy to break a person's ribs. It is my understanding that when you ease up on someone you should do it slowly or they may faint.