anything that promotes early mortality is actually not a problem, since it benefits society to kill off old people after they have finished their productive years and in the future will be living off savings (including retirement accounts and pensions), which with their demise can be repurposed for more useful things
alcohol, on the other hand, often kills people in their most productive years, which hurts society
yeshiva kids wanting to be “cool” like the goyim is a self-limiting problem, since if their big concern in life is to be like the goyim, they won’t stay in a “uncool” yeshiva environment