I raised alcohol tax to its maximum to see if it would lead to zero consumption, it did but the negative effect of the tax on poverty and equality was still there and actually getting worse by about 0.1% a turn, to be clear, the numbers say no one is drinking and no tax is coming in.
In reality a 75% alcohol tax probably wouldn’t deter that many rich or even middle income people from drinking, I’m not sure you could ever stop alcohol consumption without banning its sale/consumption, and even then you might stir up prohibition era-style bootlegging and speakeasies.
It could be interesting to have a ‘Black Market’ situation occur if you’re heavily taxing alcohol, tobacco, and/or luxury goods.