Yes, if the programs are well designed. These are called alternative development programs, where basically the government, with foreign aid, reaches a coca-producing region. If it reaches the coca-producing region in the wrong way, it's wasting the money.
If it reaches the coca-producing region in the correct way, that is, by providing not only technical education for growing licit crops, but also the means by which to bring these legal crops into the market, and in an institution that works well, this works. But if you only bring technical assistance and leave the farmers alone, that's wasting the money.
That, I think, the free trade agreement can promote. It can be promoting legal activities and promoting investment in infrastructure so that these farmers can bring their crops to the market, etc.