In some countries, like New Zealand, it has been made illegal to GROW FOOD and either sell it or give it away -- even to your neighbors. But these pathetic attempts to instill fear and NEGATIVITY can be very easily got around. Just think outside the square:
for example, you can sell RAW MILK as drain cleaner.
you can sell your veggies as pig fodder.
you can sell lemonade as silver polisher.
if people REALLY want to drink drain cleaner, eat pig food, and consume silver polish, then that is not your problem and you have broken no laws.