There's a huge need for teachers in Alaska. But as with any state, it's the sentiment of the parents and school committee you really need to worry about. I would advise utmost discretion when considering how to approach the issue of smoking/job interactions.
Weed is not in fact 100% legal in Alaska. It is decriminalized for modest amounts and plant counts of 10 or fewer. The state does not make an issue of prosecuting personal-use level growers. Even in AK, growers are quiet about their habits. But it is indeed a safer climate in which to cultivate and smoke.