Quote Originally Posted by birdgirl73
Conservative, resistant minds are an uphill battle. But I wholeheartedly believe it's a hill you should climb nonetheless.

Start by encouraging your dad to read the unbiased marijuana info at this site: http://www.erowid.org/. It's very thorough, impressively objective information about the effects of weed and other psychoactive substances.
Also present him with select info from http://www.norml.org/, which is also a good source.

Don't expect to change his closed mind. But take pride in the fact that you may make a slight inroad into its surface. And be proud of the fact that you're learning to establish and argue a valid, important point about the benefits of this substance. You'll get better at these arguments. And more persuasive. And you will be contributing to a good and necessary effort. And maybe just maybe you'll eventually begin changing other minds that are less resistant and more influential.
Who else thinks we should make birdgirl president??? Of everything???