Have right tube only and both ovaries. Have sex on fertile days. Smoke cigarettes and weed. What are chances to get pregnant? From date quit both?

More info needed. It depends if the remaining tube is functioning and whether you partner has adequate sperm and whther you are ovulating. Why do you have only one tube? Assuming that the above is in your favor, smoking does affect your fertility and youer pregnancy; so you need to quit smoking and be evaluated for ovulation and tubal patency.
6 months. It depends why you lost left tube. If you had ectopic, pid etc then chances are low. But on average takes 6 months to 1 year if other factors like hormones, uterus and sperm count is ok.