dave30... That is the most ignorant, nonsensical opinion I have ever seen on the internet. First of all.. No there isn’t, only for people with genetic defects. If you have a history of mental illness, for example. Substance abuse in general, that includes tobacco & alcohol can all reduce fertility, it's not a valid reason for illegalisation. The people of California & Holland haven’t stopped procreating. Cliché alert.. It all depends on the individual, you can abuse ANY substance. There are uninspired/demotived people EVERYWHERE, including the Netherlands where weed is tolerated. ^ This particular part of your post is so borderline retarded it's actually frightening... You want to lock somebody in a cage with rapists and murderers for personal use?, they are doing no harm to anyone. Marijuana is safer & better for you than alcohol.