what is the best drug to be addicted too

recently i’ve been considering offing myself because i see no point in life but then I remembered how weed for about 4 months made my life tolerable. Are there any other drugs that could replace weed and wouldn’t result in me becoming a complete jerk or change my whole personality. Something cheap that would extend my life by a few months before i decided to commit.

TL:DR - if you had to get addicted to any drug what drug what you choose.