By effectively preaching and teaching God's Word, yes.
By enlisting government agencies to stomp on others, no.
But who says that drinking or smoking pot is a sin? Certainly not Jesus or the Bible.
There is a term for those who create false doctrines in Christ's name, isn't there?
The net volume of sin in the world doesn't matter one whit. The angels don't celebrate over one sinner eschewing one sin or one million of 'em -- they celebrate when a lost soul repents. Making sin illegal, even if that were to decrease the amount of sin in the world, means nothing. There is no virtue in forced sinlessness