Weight may be an issue. It is a risk factor that we look at in deciding if the patient is a reasonable risk. If obese and your neck is wider than your head another risk
If you can't lean back and put your chin up- another risk
If I can't see beyond your uvula- another risk
Sleep apnea- another risk
I had a patient last year that I have sedated her a few times over many years but now she is an old 66, overweight, large neck, large tongue, limited mobility of her neck, and forward posturing of her neck so I declined to sedate her. She allowed me to take pictures of from the front and side as I consider her an example of someone who shouldn't be sedated in an office. I showed them to a OMS and an anesthesiologist who both quickly agreed that I made the right call.
We want you to stay alive at the end of it all.