it means that if the government takes actions to restrict your rights in any way, you have the right to due process or to have the action reviewed to determine the legality of the action.due process:
The idea that laws and legal proceedings must be fair. The Constitution guarantees that the government cannot take away a person's basic rights to 'life, liberty or property, without due process of law.' Courts have issued numerous rulings about what this means in particular cases.
in your situation, if air is illegal, the government has all rights to prevent you from selling air even if it you claim it benefits you in some way. You can challenge the constitutionality of making air illegal. That is your due process.
and when you talk about air, I presume you are talking about marijuana.

