I don't think it's spam it's just worry. I wouldn't let my kid grow in my house either, even though I grow, teens especially are idiots, like to blab and would tell one too many people and then swat would be all up in my house and I'd go down for it as well. So what'd you tell your shop teacher it's for? Nice cab though guy, you have some nice wood working skills. Did you tell your parents or are you just assuming because they're "cool parents" they'll be ok with it?
What are you going to use for lighting and controlling the smell?