whether it gives you alzeheimers diesese or not, do you really want to risk it, especially as it makes the smoke taste extreamly contaminated. weed is bad enough on yer lungs as it is, the tinfoil is going to damage yer lungs even more. so you KNOW that it messes up yer lungs, tastes shit, and could give yer alzheimers, surley thats enough reasons not to use tinfoil!