I've never smoked pot and I never intend to. I don't need it, don't desire it, and expect that getting high would just exacerbate my occasional underlying mild anxieties.
That said, I'm all for legalisation/decriminalisation. I only ever hear about how it's far less damaging to a person than alcohol, so I'd rather a friend smoke occasional weed than destroy their liver on copious amounts of alcohol. I seem to recall hearing a story of someone setting a challenge to someone important in starting the drug war. Something like 'if I smoke one roll-up of weed for every bottle of booze you drink, you'll die first,' something along those lines. I mean I rarely drink either, so my life would be unaffected if it were legalised here in Blighty; I'd continue to just not intoxicate myself. Yes, I'd find it annoying to get the occasional whiff of it when I'm out and about because I do not like the smell of it, but that same sentiment is still true for tobacco and alcohol (in a person's breath), so I guess it wouldn't make a huge difference to me.
I support this because the war on drugs is costly, pointless, ineffective and only ever demonises, criminalises and stigmatises victims of addiction rather than treating or helping them. I'm not saying I expect this to automatically pave the way to a new attitude towards drug users of all stripes, but it certainly opens a door.