One thing I'd address right away, because it seems to be the first question posed to Mormons in interviews.
The 'prohibition' on caffeine and strong drinks is part of the Word of Wisdom, which is EXPRESSLY not commandment. It is considered divine revelation that serves as a recommendation for temporal [ie, in this world only] betterment. ie, these are things you should do if you wish to live this life as healthy and strong as God provides. Failure to comply doesn't damn you eternally, nor does it countenance ex-communication. It is enforced more strongly for those actively representing the church, missionaries and central leadership, for the sake of presenting a wholesome face of the religion.