OMG, this is my biggest pet peeve of all time! Why people can't go for two hours without turning their phone off is beyond me--and so few people bother to think about how distracting cell phone screen light can be in a theater!
I completely agree that anything that might distract others from enjoying the movie is not okay--whether it smells or is harmful isn't the issue.
Some are hopelessly addicted to their smart phones. There's a guy at work who is halfway out the door because he can't go 15 minutes without checking his phone. He'll be fired by Thanksgiving.