How does Brave New World express the issue of propaganda?

There is constant propaganda in BNW. The cute sayings and quips are meant to reinforce the ideology of the party. Consider:

"you do look glum! What you need is a gramme of soma."

"..there is always soma, delicious soma, half a gramme for a half-holiday, a gramme for a week-end, two grammes for a trip to the gorgeous East, three for a dark eternity on the moon..."

"Never put of till tomorrow the fun you can have today."