Force stop the change of legal smoking age in texas

The legal age to buy tobacco products in the u.s. has always been 18 and up now a law had been passed to up the legal age to 21 and up and I don't see it being fair because us adults that are between ages 18 and 20 have been legal age for as long as we can remember how do they expect us to just stop smoking and buying cigarettes because we are not 21 i think this law is stupid and out of place i believe it should be thrown out