[sageb1]

I doubt it. I know too many people who smoked dope who have normal children. I don’t know if additives/pesticides play a factor now, however.

[Gondring]

I doubt it. I know too many people who smoked dope who have normal children.

But it's a numbers game. If the chance of genetic damage is there, but low, then the overwhelming majority of children would be fine. But even a small increase could mean a large percentage increase in the rate of the disorder.

I don’t know if additives/pesticides play a factor now, however.

Current thinking is turning toward additive or multiplicative effects of multiple agents. A person might be exposed to 5 different agents at below the "1 in a million increase in cancer" or "no obvious effects" level, and old thought was "no effect"...but the overall effect might really be much greater.

And again, this might be a bit of a chance thing--99.9% are fine, but occasionally, even the low-level risk will impact someone.

Disclaimer: I am not a human-health or risk assessment professional.