Chinese Habit: Drinking Wine

“感情深，一口闷；感情浅，舔一舔”

"deep friendship one shot; shallow friendship drinking little by little"

(according to Chinese role when having a toast)

Glass position during the toast: the glass belongs to the younger person must be lower than the older person

However, if you realize that you are not a good drinker, while your Chinese host keeps offering you to have another toast (ganbei), then you can say: 随意 (suí yì ) which means refusing politely to have another toast due to a particular reason, for example you've got headache already.